Multiple Choice Questions

A boat in a river with speed of stream as 6 km hr can travel 7 km upstream and back in 4 hours What ...........

Quantitative Aptitude (CPO) Boats and Streams

A boat in a river with speed of stream as 6 km/hr can travel 7 km upstream and back in 4 hours. What is the speed of the boat in still water?

10 km/hr

8 km/hr

11 km/hr

12 km/hr

Solution:
Let speed of boat is x km/hr
So
7/(x+6) + 7/(x-6) = 4
Solve, x = 8 km/hr [ignore the negative root because speed cannot be negative]

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