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An express train travelled at an average speed of 100 km/hr, stopping for 3 minutes after every 75 km. How long did it take to reach its destination 600 km from the starting point?

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Time taken to cover 600 km = (600/100)hrs =6 hrs.
Number of stoppages = 600/75 - 1 =7.
Total Time of stoppages= (3 x 7)min=21 min.
Hence, total time taken=6 hrs 21 min.

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