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Railways PYQCBT 1 2016

RRB NTPC · Question 54

If Vinay had run at a speed of 2 km/h faster, he would have taken 10 minutes less to cover 4 km, find the speed of Vinay? A. 7 km/h B. 5 km/h C. 4 km/h D. 6 km/h

  1. D

  2. B

  3. C

  4. A

Show answer & explanation

Answer: (A) D

Explanation

4/v − 4/(v + 2) = 10/60 = 1/6. So 8/(v(v + 2)) = 1/6, giving v(v + 2) = 48 and v = 6 km/h.