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Question

Two trains C and D started from point A and B respectively. Speed of train D is 21 km/hr more than that of train
C. Total distance between point A and B is 495 km. If both the trains meet in 3 hours 40 minutes, then find the speed of train D (in km/hr).

A 62 km/hr

B 57 km/hr

C 60 km/hr

D 78 km/hr

E None of these

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