Question

The speed of a boat in still water is 20 kmph, and the speed of the stream is 2 kmph. In how many hours would the boat cover a distance of 198 km downstream?
1. 11 hours
2. 6 hours
3. 9 hours
4. 15 hours

Answer 1

Correct Answer - Option 3 : 9 hours

Given

Speed of boat = 20 km/h

Speed of stream = 2 km/h

Formula used

Distance = Speed × Time

Downstream speed = Speed of boat + Speed of stream

Calculation

Downstream speed = 20 + 2 = 22 km/h

∴ Required time = 198/22 = 9 Hr