Multiple choice

If downstream speed of a boat is 16 kmph and its upstream speed is 11 kmph, what is the speed of stream?

  1. 1.5 kmph

  2. 2 kmph

  3. 3 kmph

  4. 2.5 kmph

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let boat speed = b, stream speed = s. Downstream: b + s = 16. Upstream: b - s = 11. Adding equations: 2b = 27, so b = 13.5 kmph. Then s = 16 - 13.5 = 2.5 kmph. Alternatively, using formula: stream speed = (downstream - upstream)/2 = (16-11)/2 = 2.5 kmph. So option D (2.5 kmph) is correct.

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