Latest reasoning Aptitude Question SOLUTION: A person crosses a river on a paddle boat. He took 4 hours while paddling against the water flow and 3 hours while paddling in the direction of the water flow. On still waters,

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(#M40020473) REASONING question reasoning Keep an EYE

A person crosses a river on a paddle boat.
He took 4 hours while paddling against the water flow
and 3 hours while paddling in the direction of the water flow.
On still waters, how long would he take?

Asked In reasoning MAN (10 years ago)

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varanasijagadeesh  (7 years ago)

let, the velocity of the boat be u,and velocity of current be v. then
u+v = 3&u-v = 4 solving this we get ,
u = 3.5

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abhishek mittal  (7 years ago)

4+3=7
7/2=3.5

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vinodhini  (7 years ago)

Answer 3.4 hrs

Let the distance be 12 kms.
Given, Time for downstream,U = 3hrs
Time for Upstream, V = 4hrs
So, U = 4km/hr and V = 3km/hr.
Speed of the boat in still water, a = 1/2(U+V) = 1/2(4+3) = 3.5km/hr
Now, time taken for the boat in still water is = 12/3.5 = 3.4hrs.

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