Multiple choice

If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 km/hr, then what is the speed of the stream?

  1. 13 km/hr

  2. 26 km/hr

  3. 34 km/hr

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let boat speed = b km/hr and stream speed = s km/hr. Downstream: b + s = 40. Upstream: b - s = 14. Adding: 2b = 54, b = 27. Subtracting: 2s = 26, s = 13. Therefore stream speed is 13 km/hr.

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