Question

The ratio of the speed of a launch in still water to the speed of the stream is 8 : 1. If the speed of the launch is increased by 25%, it takes 5 hours to go 165 km downstream. Find the speed of the launch in still water.

A 18 km/hr
B 15 km/hr
C 12 km/hr
D 24 km/hr
E None of these
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