Multiple choice

A boat can travel 200 km upstream in 20 hours. Another boat can travel 150 km downstream in 10 hours. The speed of the stream is same in both the cases. If the speed of first boat is 50% higher than the speed of the second boat, find the speed (in kmph) of the stream?

  1. 12 km/hr

  2. 14 km/hr

  3. 5 km/hr

  4. 8 km/hr

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

First boat: upstream speed = 200/20 = 10 km/h. x - y = 10. Second boat: downstream speed = 150/10 = 15 km/h. z + y = 15. First boat 50% faster than second: x = 1.5z. Solving: x = 10, y = 5. Stream speed = 5 km/h. Option C correct.

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