A man can swim 3 kmph in still water. If the velocity of the stream be 2 kmph, the time taken by him

Supriya Mondal   9 years AGO

Relative speed in upstream is=3-2=1km/hr
and relative speed in downstream is=3+2=5km/hr
So, time taken to complete 10km in upstream is=10/1=10hr
and time taken to complete 10km in downstream is=10/5=2hr
So, total time taken=10+2=12hr
So, option 4)12hr is the right answer

Like? Yes (14) | No   

SUSHANT KUMAR   9 years AGO

TIME TAKEN TO SWIM ALONG WITH STREAM = 10/(3+2)=2HRS
TIME TAKEN TO SWIN AGAINST THE STREAM=10/(3-2)=10 HRS
SO TOTAL TIME TAKEN=10+2=12HRS.

Like? Yes (6) | No   

Prateek Dalakoti   9 years AGO

As on still water his speed is 3km/h
speed of stream is 2km/h.

while going upstream speed of man will be (3-2)km/h=1km/h
so time to travel 10km = 10hrs

and while going downstream speed of man will be 3+2=5km/h

so time to travel 10km downstream = 10/5= 2hrs

So total time = 10hrs + 2hrs = 12 hrs

Like? Yes (5) | No   

Devendra Marghade   9 years AGO

Upstream speed=3-2=1 Kmph.
Downstream speed=3+2=5 Kmph.
Total time taken to cover 10 Km. upstream & 10 Km. downstream=(10/1) + (10/5) =12 hrs.
So answer=Option (4)

Like? Yes (3) | No   

RAKESH   9 years AGO

10/(3-2) + 10/(3+2) = 12hrs

Like? Yes (2) | No   

Anuradha   9 years AGO

speed upstream =speed of man-speed of stream=3-2=1
speed downstream =speed of man+speed of stream=3+2=5

speed=distance/time
time taken to go upstream=distance/speed=10/1=10hr
time taken to go downstream=distance/speed=10/5=2hr

totaltime=10+2=12hr

Like? Yes (2) | No   

siddharth prakash singh   9 years AGO

still water speed = 3 kmph
velocity of the stream = 2 kmph
upstream velocity=(3-1)= 1kmph
downstream velocity= (3+2)= 5kmph
so time taken to cover 10 km upstream and downstream= (10/1) +(10/5)=10+2 =12hrs

Like? Yes (2) | No   

Harsh Poddar   9 years AGO

time taken for 10 km upstream=10/(3-2)=10hrs
time taken for 10 km downstream=10/(3+2)=2 hrs
total time taken=10+2=12 hrs

Like? Yes (1) | No   

kranthi kanchanapally   9 years AGO

time taken to cover upstream 10km is 10/(3-2)=>10

time taken to cover downstream 10km is 10/(3+2)=>2

time taken to cover upstream 10km and downstream 10km is 10+2=>12hrs

Like? Yes (1) | No   

prabhat kumar   9 years AGO

up 10/5=2
down 10/1=10
tot=12hr

Like? Yes (1) | No   

umesh   9 years AGO

speed in downstream is 3-2=1kmph
speed in upstream is 3+2=5kmph
t=10/1+10/5
12hr..ans.

Like? Yes (1) | No   

Surit Datta   9 years AGO

according to the question,
10/(3 + 2) + 10/(3 - 2) = 12hours
so option 4
that's it.

Like? Yes (1) | No   

Jaspalsingh Parmar   9 years AGO

t1= 10/(3+2) = 2
t2= 10/(3-2) = 10
total time= 12 hrs

Like? Yes (1) | No   

Jay parmar   9 years AGO

total time = 12 hrs

Like? Yes (1) | No   

Subrata Sadhukhan   9 years AGO

total distance=(10+10)=20km.
at the upstream his velocity=(3+2)=5km
time taken to reach the end of 10 km is 2h
and when he back his velocity=(3-2)=1km.
time taken to back to his starting point(means he cover 10km distance)= 10h
so the total time is=(10+2)=12h

Like? Yes (1) | No   

ABHINAV PUSHPAM   9 years AGO

Answer is 12 hrs

Like? Yes (1) | No   

neha gupta   9 years AGO

Net Upstream speed is (3-2)=1km/hr
Net Downstream speed is (3+2)=5km/hr
one side distance is 10km
Therefore Upstream time=10/1=10hrs
Downstream time=10/5=2hrs
Total time=10+2=12hrs
Thus 12hrs is the answer.

Like? Yes (1) | No   

sravani   9 years AGO

10/3-2 + 10/3+2 =12 Hrs..

Like? Yes (1) | No   

Srinivas   9 years AGO

10/(3+2) + 10/(3-2)
=12

Like? Yes (1) | No   

Neeraja Aruva   9 years AGO

D=10km , Downstream speed =3+2=5km/hr,Upstremspeed = 3-2=1km/hr
time = D/S
T= D/Downstream speed +D/Upstream speed
= 10/5 +10/1
2+10=12hrs

Like? Yes (1) | No   

sompon temtheerakij   9 years AGO

upstream , velocity = 3-2 = 1 km/h
10 km = 10 hrs.
back , velocity = 2+3 = 5 km/hr
10 km = 2 hrs
total = 10+2 = 12 hrs

Like? Yes (1) | No   

kishore   9 years AGO

for upstream = 3-2 = 1kmph for 10 km = 10 hours will take
and for coming back downstream = 3+2 = 5kmph for 10 km it will take 2hours
so total 12 hours

Like? Yes (1) | No   

MD JAVED SALIM   9 years AGO

(10/5)+(10/1)=12

Like? Yes (1) | No   

Gourav Rajdhar   9 years AGO

Time taken for upstream
3km/h + 2km/h = 5km/h
Time = Distance/Speed
Time = 10/5
Time = 2hrs (time taken for upstream)
Time taken for back stream

Like? Yes (1) | No   

PAWAN KUMAR   9 years AGO

Time upstream = 10/(3-2) = 10 Hrs
Time downstream = 10/(3+2) = 2 Hrs
So, Total time = 10+2 = 12 Hrs.

Like? Yes (1) | No   

charu goyal   9 years AGO

upstream-10hr
downstream-2hr
total time-12hr

Like? Yes (1) | No   

Niraj   9 years AGO

Speed of upstream = (3-2)km/hr = 1 km/hr
Speed of downstream (3+2) km/hr = 5 km/hr
Total time taken = (10/1+10/5) hrs = 12 hrs

Like? Yes (1) | No   

aman aditya   9 years AGO

for going upstream 10/(3-2)=10 hr
for down stream 10/(3+2)= 2 hr
total=10+2=12 hr

Like? Yes (1) | No   

Abhishek Ranjan   9 years AGO

upstream time = 10/(3+2)=2hrs
downstream time= 10/(3-2)=10hrs
total time= 12hrs

Like? Yes (1) | No   

jaganmohan rao .pola   9 years AGO

10/(3-2) + 10/(3+2) = 12hours

Like? Yes (1) | No   

Aditi Tenguria   9 years AGO

upstream = 3-2 =1 kmph
downstream =3+2 =5 kmph
time taken to cover upstream =10/1=10hr
time taken to cover downstream =10/5=2hr
total time = 10+2 =12 hr

Like? Yes (1) | No   

praveen kumar   9 years AGO

ans 4 is correct

Like? Yes (1) | No   

Ritu Priya   9 years AGO

speed during upstream=1 kmph
speed during downstream=5 kmph
time to cover 10 km upstream= distance/speed = 10/1=10hr
time to cover 10 km downstream= distance/speed = 10/5=2hr
total time = 12 hrs.

Like? Yes (1) | No   

Madhumoy Gope   9 years AGO

(10/(3-2))+(10/(3+2))=10+2=12 hours

Like? Yes (2) | No (1)  

ankit kamboj   9 years AGO

B=velocity of boat=3km/hr ;;;; R=velocity of river=2km/hr ;;;;;;
U=upstream velocity=B-R=1km/hr ;;;;;;; D=downstream velocity=B+R=5km/hr ;;;;;;;;;
Speed=Distance/Time ;;;;;;;;;;;
Time=Distance/speed ;;;;;;;;;;
Given distance =10km
Total time= time upstream +time downstream
= 10/1 + 10/5
= 10 + 2
==== 12 hrs

Like? Yes (1) | No   

Apurva chowksey   9 years AGO

3-2=1...10hrs....3+2=5...2hrs.....ans=12hrs

Like? Yes (1) | No   

jalaj   9 years AGO

Time taken to go upstream and back is =d/t=10/3-2+10/3+2=12
upstream speed=speed in still water - speed in upstream=3-2
downstream speed(while going back) speed in still water+ speed in downstream=3+2

Like? Yes (2) | No (1)  

Vinod Kumawat   9 years AGO

upstream 3+2=5kmph
downstream 3-2=1kmph

Like? Yes (1) | No   

Pranati Kundu   9 years AGO

time taken for upstream =10/5=2hr
time taken for downstream =10/1=10hr
total time taken =12hr

Like? Yes (1) | No   

vivek   9 years AGO

speed of boat in upstream=3-2=1km/hr and in downstream=3+2=5km/hr
total time taken = (10/1)+(10/5)= 12 hr

Like? Yes (1) | No   

M.Ranjith Kumar    9 years AGO

in against streamhe will swim 1 kmph so hewill take 10 hrs,and with stream he will swim 5 kmph so he will take 2 hrs so totally 12 hrs

Like? Yes (1) | No   

SANDIPAN BANERJEE   9 years AGO

upstream:
Speed=3-2=1km/hr
D=10km
So Time=10/1=10hrs

downstream:
Speed=3+2=5km/hr
D=10km
So Time=10/5=2hrs

Therefore, Total time taken=10+2=12hrs

Like? Yes (1) | No   

suraj nath prasad   9 years AGO

for upstream speed will be 3-2 & for dowmstream speed will be 5

Like? Yes (1) | No   

deep   9 years AGO

man u stream v
downwards=u+v=5
upwrds=u-v=1
t=10/5 down
t=10/1 upwrds
t down + t up= 12

Like? Yes (1) | No   

Arnab Majumder   9 years AGO

in case of up stream total velocity=3+2 kmph
so, time=10/5=2hrs
in case of back total velocity=3-2kmph
time=10/1=10hrs
10+2=12hrs

Like? Yes (1) | No   

Udhaya kumar   9 years AGO

{10 / (3-2)}+{10 / (3+2)} = 12...........

Like? Yes (1) | No   

MRITUNJAY   9 years AGO

upstream speed=3-2=1kmph
downstream speed=3+2=5kmph

time=10/1+10/5=12 hrs

Like? Yes (2) | No (1)  

bhishma   9 years AGO

upstream 3+2=5kmph
downstream= 3-2=1kmph
time=2+10=12h

Like? Yes (1) | No   

shaik sharina   9 years AGO

upstream speed=3-2=1kmph
downstream speed=3+2=5kmph
time taken =(10/1)+(10/5)=12kmph

Like? Yes (1) | No   

SAGNIK DATTA   9 years AGO

time taken for upstream = 10/(3-2)
time taken for downstream=10/(3+2)
so total = 12

Like? Yes (1) | No (1)