Latest self Aptitude Question SOLUTION: A bridge has to be crossed. only 2 persons can cross it at a time because only 1 torch is available which is necessary to cross it. there are 4 peoply named acc. to the time they t

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(#M40034264) SELF Numerical Ability question river Keep an EYE

A bridge has to be crossed. only 2 persons can cross it at a time because only 1 torch is available which is necessary to cross it. there are 4 peoply named acc. to the time they take to cross i..e 1,2,5 and 10 (they take the time in sec).what minimum time will they take to cross the bridge ??

PARVY GOVIL (10 years ago)

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Ann Theressa  (10 years ago)

17 sec

1st 1 and 2 will cross the bridge which takes ==> 2 seconds
and 1 will come back with the torch ==> 1 second
then 5 and 10 will cross ===> 10 seconds
2 will come back with the torch == > 2 second
finally 1 and 2 will cross the bridge ==> 2 second

total time taken = 2+1+10+2+2 = 17 seconds

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kalaivani  (10 years ago)

the answer is 17

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