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Quantitative Aptitude :: Boats and Streams - Discussion

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Choose the correct option.

A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2 hours 30 minutes to cover a distance of 5 km upstream. Find the speed of the current.

A1 km/hr

B2 km/hr

C3 km/hr

D4 km/hr

ENone of these

Answer: Option (Login/Signup)

Show Explanation

Solution;  Let the speed of the boat be x and speed of stream be y



Acc. to the question:  15/(x+y ) =15/4 hr ......(i)   and 5/(x-y) =  5/2 hr



Solving the two equations we get x= 3kmph and y= 1kmph.



IMP: WHEN WE MOVE UPSTREAM SPEEDS GET SUBTRACTED AND WHEN WE GO DOWNSTREAM SPEEDS GET ADDED UP.

 

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