Q: An express train travelled at an average speed of 100 kilometres per hour, pausing for 3 minutes every 75 kilometres. How long did it take to go 600 kilometres from its starting point?
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A
6 hrs 27 min
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B
6 hrs 24 min
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C
6 hrs 21 min
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D
6 hrs 30 min
C
Answer:
C
Explanation:
Time taken to cover 600 km = distance/speed = 600 km / 100 km/hr = 6 hours
Number of stoppages = distance/stoppage interval - 1 = 600 km / 75 km - 1 = 7
Total time of stoppages = number of stoppages * duration of each stoppage = 7 * 3 minutes = 21 minutes
Total time taken = time taken to cover the distance + total time of stoppages = 6 hours + 21 minutes = 6 hours 21 minutes.
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