In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

A 3 kmph

B 5 kmph

C 8 kmph

D 9 kmphr

Solution

Correct Answer: Option C

Speed in still water
= 12
=1/2(11 + 5) kmph
= 8 kmph