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Multiple Choice Questions

A boat takes 150 min less to travel 40 km downstream than to travel the same distance upstream The s...........

Quantitative Aptitude (CPO) Boats and Streams

A boat takes 150 min less to travel 40 km downstream than to travel the same distance upstream. The speed of the stream is 4 km/hr. What is the downstream speed?

16 km/hr

12 km/hr

10 km/hr

8 km/hr

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Explanation:

Let speed of boat in still water = x km/hr
So speed upstream = x-4, and speed downstream = x+4
Now given:
Time to travel 40 km downstream = time to travel 40 km upstream – 150/60
So 40/(x+4) = 40/(x-4) – 5/2
8/(x-4) – 8/(x+4) = 1/2
x+4 – (x-4)/(x2 – 16) = 1/16
solve, x = 12
so downstream speed = 12+4=16

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