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Railways PYQCBT 1 2016

RRB NTPC · Question 74

A car covers the first 30 km at a speed of 60 kmph and the next 20 km at 80 kmph. Find the average speed?

  1. 65.67 kmph

  2. 65.33 kmph

  3. 66.33 kmph

  4. 66.67 kmph

Show answer & explanation

Answer: (D) 66.67 kmph

Explanation

Time for the first 30 km = 30/60 = 0.5 h, and for the next 20 km = 20/80 = 0.25 h. Average speed = total distance / total time = 50/0.75 ≈ 66.67 km/h.