Multiple choice

The sum of the speed of boat in still water and along the stream is 20 kmph and the speed of the boat against stream is 10 kmph. What is the speed of stream?

  1. 2 kmph

  2. 4 kmph

  3. 5 kmph

  4. 6 kmph

  5. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
AI explanation

The sum of the speed of the boat in still water and its speed along the stream represents the effective downstream speed added to the upstream speed, establishing the speed in still water as (20 + 10) / 2 = 15 kmph. The speed of the stream is calculated as (20 - 10) / 2 = 5 kmph.