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Multiple Choice Questions

A boat can row 18 km downstream and back in 8 hours If the speed of boat is increased to twice its p...........

Elelmentary Mathematics (UPPCS) Boats and Streams

A boat can row 18 km downstream and back in 8 hours. If the speed of boat is increased to twice its previous speed, it can row same distance downstream and back in 3.2 hours. Find the speed of boat in still water.

9 km/hr

5 km/hr

4 km/hr

6 km/hr

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Explanation:

Solution:
Let speed of boat = x km/hr and that of stream = y km/hr
So
18/(x+y) + 18/(x-y) = 8
when speed of boat becomes 2x km/hr:
18/(2x+y) + 18/(2x-y) = 3.2
Solve, x= 6 km/hr

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