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Q.

A boat-man can row a boat to make it move with a speed of 10km/h   in still water. River flows steadily at the rate of 5km/h  and the width of the river is 2km  . If the boat man cross the river along the minimum distance of approach then time elapsed in rowing the boat will be: 

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a

2 3 5 h  

b

2 5 3 h  

c

3 2 5 h  

d

5 2 3 h    

answer is B.

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Detailed Solution

sinθ= 5 10 =1/2⇒θ= 30 ∘ t min = 2 v br cosθ = 2 10 3 2 = 2 5 3    
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