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Railways PYQCBT 2 2017

RRB NTPC · Question 80

Mr. Prasad travelled equal distances at speeds of 2 km/hr., 4 km/hr., and 6 km/hr., and took a total of 55 minutes to complete. Find the total distance he travelled, in km.

  1. 2

  2. 1

  3. 4

  4. 3

Show answer & explanation

Answer: (D) 3

Explanation

Let each part be d km. Time = d/2 + d/4 + d/6 = d(6 + 3 + 2)/12 = 11d/12 hours. This equals 55 minutes = 11/12 hour, so d = 1 and the total distance = 3 km.