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Railways PYQCBT 1 2016

RRB NTPC · Question 60

A man, rowing a boat, covers a distance of 16 km in two hours downstream. He covers half the distance in the same amount of time when rowing upstream. Calculate the speed of the stream. A. 4 km/hr B. 2 km/hr C. 3 km/hr D. 1 km/hr

  1. C

  2. A

  3. D

  4. B

Show answer & explanation

Answer: (D) B

Explanation

Downstream speed = 16/2 = 8 km/h; upstream he covers 8 km in 2 hours, i.e. 4 km/h. Speed of the stream = (8 − 4)/2 = 2 km/h.