A train moves with a speed of 30 kmh- 1 in the first 15 minutes, with another speed of 40 kmh-1 the next 15 minutes, and then with a speed of 60 kmh -1 in the last 30 minutes. Calculate the average speed of the train for this journey.
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Answer:
40km/hr
Explanation:
Time taken = Distance / Speed
Time taken to cover first 15 km = 15/30 = 0.5 hours
Time taken to cover next 75 km = 75/50 = 1.5 hours
Time taken to cover last 10 km = 10/20 = 0.5 hours
Average Speed of train = Total Distance Covered / Total time taken = (15 + 75 + 10) / (0.5 + 1.5 + 0.5) = 100/2.5 = 40 km/hr
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