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Railways PYQCBT 1 2016

RRB NTPC · Question 64

A man can row his boat at speed of 4 km/hr and he finds that the time taken rowing upstream is double to that taken downstream. Find the speed of the stream (in km/hr). A. 1.5 B. 1.3 C. 2 D. 1

  1. D

  2. A

  3. B

  4. C

Show answer & explanation

Answer: (C) B

Explanation

Upstream takes twice as long, so the upstream speed is half the downstream speed: 4 + s = 2(4 − s). Then 3s = 4 and s = 4/3 ≈ 1.33 km/h.