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Averages Q.8

0. A train runs for 2 hours at a speed of 35 kmph. It runs for 3 1/2 hours at the speed of 60 kmph and then runs for 2 1/2 hours at the speed of 70 kmph. Find the average speed of the train.

  • Option : D
  • Explanation : Distance travelled in 2 hours = 35 × 2 = 70 km
    Distance travelled in next 3 1/2 hours = 60 × 3.5 = 210 km
    Distance travelled in next 2 1/2 hours = 70 × 2.5 = 175 km
    Total distance = 70 + 210 + 175 = 455 km
    Average speed = Total distance/Total time taken = (70 + 210 + 175)/(2 + 3.5 + 2.5) = 455/8 = 56.87 kmph
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