Latest Infosys Aptitude Question SOLUTION: A person says that their speed while going to a city was 10mph however while returning as there is no much traffic they came with a speed of 15mph. what is their average speed?

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(#M40032370) INFOSYS Logical Reasoning question Avg Speed Keep an EYE

A person says that their speed while going to a city was 10mph however while
returning as there is no much traffic they came with a speed of 15mph. what is their
average speed?

Asked In Infosys vijay (10 years ago)

Solved sharan kumar Read Solution (20)

Is this Puzzle helpful?   (48)   (14) Submit Your Solution Mathematical Reasoning

Read Solution (20) :

sharan kumar   (10 years ago)

Avg speed= 2xy/x+y
Hence Ans: 12

Is this solution Helpfull? Yes (36) | No   

nita  (10 years ago)

Don't fall in the trap of just averaging the 2 speeds. Overall average speed is not (S1+S2)/2. ***
Total average speed is simply = Total distance/Total time
Lets say,
D = distance travelled by the car in EACH direction
t1 = time spent on onward trip
t2 = time spent on return trip
Thus, the total distance travelled by the car = D+D= 2D
And, by the formula, Speed = Distance/Time
S1 = D/t1 => t1 = D/S1
S2 = D/t2 => t2 = D/S2
Total average speed = Total Distance/Total time = 2D/(t1+t2) = 2D/(D/S1+D/S2) = 2S1*S2/(S1+S2)

Is this solution Helpfull? Yes (23) | No   

manasa yellamanchili  (10 years ago)

ans is 12(2xy/x+y)

Is this solution Helpfull? Yes (6) | No   

yukti  (10 years ago)

12 as avg speed =(2*10*15)/(10+15)

Is this solution Helpfull? Yes (4) | No   

SUDHIR SHARMA  (10 years ago)

average speed=(2*x*y)/(x+y)
therefore average speed=2*10*15/15+10=12mph

Is this solution Helpfull? Yes (2) | No   

Vijayalaxmi Vuppala  (10 years ago)

average speed=2xy/x+y;
so,(2*10*15)/10+15
so ans 12

Is this solution Helpfull? Yes (2) | No   

deepak sharma  (9 years ago)

acco to frmla......
2xy/(x+y)
2*10*15/25=12.

Is this solution Helpfull? Yes (2) | No   

Mahes Waran  (10 years ago)

consider distance was 30mil
so going time 10*3 hrs = 30mil
on return 15*2 = 30mil

avg speed = total distance/total time
so = 60/5 = 12mph

Is this solution Helpfull? Yes (1) | No   

Chirag Ranjan Lahiri  (9 years ago)

12 as avg speed =(2*10*15)/(10+15)

Is this solution Helpfull? Yes (1) | No   

keerthana chennamsetty  (9 years ago)

12.5 km/h.

Is this solution Helpfull? Yes (1) | No (5)  

sakshi soni  (8 years ago)

12
as this is

Is this solution Helpfull? Yes (1) | No   

ritu goyal  (10 years ago)

(2*10*15)/(10+15)=12

Is this solution Helpfull? Yes | No   

Shriram Dhakad  (10 years ago)

avg speed s =2xy/x+y
x=10
y=15
s= (2*10*15)/(10+15)
s= 12kmph ans

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SANTANA PANDA  (10 years ago)

avg speed 12 answer

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SIDDHARTH SAHU  (10 years ago)

since Total avg speed=total dist travelled/total time taken
=2D/(D/15 +D/10)=12 mph

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Binjal Gohil  (7 years ago)

avg = 2xy/x+y
because distance is constant or same.
Hence ans is
Avg = 2*10*15/10+15
avg= 2*10*15/25
Avg=12mph

Is this solution Helpfull? Yes | No   

harkirat kaur  (6 years ago)

10+15=25.
25/2=12.5

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anshu  (6 years ago)

12 2xy/x+y

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yash jain  (6 years ago)

12
2v1v2/(v1+v2)

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Rajaboina Radhika  (6 years ago)

avg speed=2xy/x+y
=2*10*15/10+15
=12
ans is 12mph

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