A boat can travel 9 6 km downstream in 36 min If speed of the water current is 10 of the speed...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat can travel 9.6 km downstream in 36 min. If speed of the water current is 10% of the speed of the boat in downstream. How much time will boat take to travel 19.2 km upstream ?

2 hrs

3 hrs

1.25 hrs

1.5 hrs

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Explanation:

Speed of downstream = 9.6/36 km/min=16 km/hr
Speed of current = 1.6 km/hr
Let speed of man in still water = 'x'
So, x = 16 – 1.6 = 14.4 km/hr
Required time in upstream = 19.2/(14.4−1.6) = 1.5 hours