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A train covers 180 km distance in 4 hours. Another train covers the same distance in 1 hour less. What is the difference in the distances covered by these trains in one hour?
Speed of first train = 180/4 = 45 kmph.
Speed of second train = 180/3 = 60 kmph.
First train covers 45 km in 1 hour and second train covers 60 km in 1 hour.
Difference between them = (60 - 45)km = 15km.
Hence, option D is the correct answer.
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