Multiple choice

Without stoppages, a train travels with an average speed of 40 km/hr, while with stoppages, it covers the same distance with an average speed of 30 km/hr. What is the time (in minutes per hour) for which the train stops?

  1. 20

  2. 30

  3. 10

  4. 15

  5. 12
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D Correct answer
Explanation

In 1 hour, the train covers 40 km without stops and 30 km with stops. The loss of 10 km is due to stops. Time taken to cover 10 km at 40 km/hr is (10/40) * 60 = 15 minutes.

AI explanation

Without stoppages, the train covers 40 km in one hour, but with stoppages it covers only 30 km in one hour. This means the train takes the equivalent of the time needed to travel 10 km less as stopping time. At its normal speed of 40 kmph, traveling this 10 km distance takes 10 divided by 40 hours. Multiplying by 60 minutes gives a stopping time of 15 minutes per hour.

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