A steam boat goes across a lake and comes back
Text Solution
Verified by ExpertsThe correct answer is:
B
If the breadth of the lake is l and velocity of boat is v b . Time in going and coming back on a quite day
Now if v a is the velocity of air- current then time taken in going across the lake,
[As current helps the motion]
and time taken in coming back 
[As current opposes the motion]
So 
From equation (i) and (ii)
i.e. 
i.e. time taken to complete the journey on quite day is lesser than that on rough day.
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