Two hours after train A has started its journey, train B started from the same point to the same direction at a speed of 18 km/h. If the speed of train A is 9 km/h then how many hours would it take for train B to catch the first train?
A. 5
B. 4
C. 3
D. 2
E. 1
সঠিক উত্তরঃ
D.
2
Explanation:
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