Question

The boat goes with the stream at the speed of 12 kmph and goes against the stream at the speed of 8 kmph. Then find the speed of boat in still water.

1. 6 kmph
2. 8 kmph
3. 10 kmph
4. 12 kmph

Answer 1

Correct Answer - Option 3 : 10 kmph

Given:

Downstream speed = d = 12 kmph

Upstream speed = u = 8 kmph

Formula used:

Speed of boat in still water = (d + u)/2

Calculations:

Let the speed of boat in still water be S

⇒ S = (12 + 8)/2

⇒ S = 20/2

⇒ S = 10 kmph

∴ The speed of boat in still water is 10 kmph