A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2 hours 30 minute...........

Quantitative Aptitude ( CCS) Boats and Streams

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.

1 km/h

2 km/h

3 km/h

4 km/h

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Explanation:

First of all, we know that
speed of current = 1/2(speed downstream - speed upstream) [important]
So we need to calculate speed downstream and speed upstream first.
Speed = Distance / Time [important]
Speed upstream =(15/3/34)km/hr=15×4/15=4km/hrSpeed Downstream = (5/2.5)km/hr=5×2/5=2km/hrSo speed of current = 0.5(4−2)=1km/hr