Latest L&T Aptitude Question SOLUTION: Four persons have to cross the bridge they are having one torch light. Four persons take 1,2,5,10 minutes respectively, when two persons are going the will take the time of the slo

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(#M40011831) L&T Logical Reasoning question Keep an EYE

Four persons have to cross the bridge they are having one torch light. Four persons take 1,2,5,10 minutes respectively, when two persons are going the will take the time of the slowest person what is the time taken to cross all of them.

Asked In L&T Arun Sairam (11 years ago)

Unsolved Read Solution (9)

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Read Solution (9) :

Sri Harsha  (11 years ago)

Ans: 17 min
Let A takes 1 min, B takes 2 min, C takes 5 min, D takes 10 min
First A & B goes=> 2 min
A returns=> 1 min
C & D goes=>10 min
B returns=>2 min
A & B goes=>2 min
Taotal time=2+1+10+2+2=17min
Therefore, 17 min is the minimum time

Is this solution Helpfull? Yes (109) | No (8)  

PARAG KAMRA  (11 years ago)

ans:17 minute
Let A takes 1 min, B takes 2 min, C takes 5 min, D takes 10 min
1)first A and B will go (total 2 minute)
2)A will return (1 minute)
3)then C and D will go (10 minute)
4)then B will return (2 minute)
5)at last A and B will go(2 minute)
now add all minute to get total time
2+1+10+2+2=17 minute(ans)

Is this solution Helpfull? Yes (12) | No (11)  

shashi  (9 years ago)

for questions like these, time is always [(Time got by adding all 4) - 1]
i.e.

1 + 2 + 5 + 10 = 18 - 1 = 17 Ans

Is this solution Helpfull? Yes (10) | No (3)  

mohini gupta  (10 years ago)

17 min.
a and b go= 2 min
a returns=1 min
c and d goes=10 min
b returns= 2 min
a and b goes=2 min
total=2+1+10+2+2=17

Is this solution Helpfull? Yes (6) | No (2)  

thangamari  (11 years ago)

ans is 19 mins
at first 1 & 10 cross the bridge =>10min
1 is return & cross with 5 =>1+5min
...
totally=10+1+5+1+2
=>19mins..

Is this solution Helpfull? Yes (4) | No (32)  

vinodh  (11 years ago)

first 10 n 1 goes-- so time is 10secs + return 1sec=11sec
next 5 n 1 goes-- so time is 5secs + return 1sec=6sec
finally 2 n 1 goes-- so time is 2secs=2sec
total 11+6+2=19sec

Is this solution Helpfull? Yes (1) | No (10)  

manish nautiyal  (10 years ago)

2+1+10+2+2=17 mins is right ANS

Is this solution Helpfull? Yes (1) | No (2)  

jnv somayajulu  (8 years ago)

1 & 2 then 2 dropped, 1 came back
5 & 10 then both dropppped 2 came back
Now 1 & 2 will go
Total time 2 + 1 + 10 + 2 + 2 = 17

Is this solution Helpfull? Yes (1) | No   

jnv somayajulu  (8 years ago)

1 & 2 then 2 dropped, 1 came back
5 & 10 then both dropppped 2 came back
Now 1 & 2 will go
Total time 2 + 1 + 10 + 2 + 2 = 17

Is this solution Helpfull? Yes (1) | No   

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