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2 hours after a freight train leaves Delhi, a passenger train leaves the same station travelling in the same direction at an average speed of 18 km/hr. After travelling 4 hrs, the passenger train overtakes the freight train. Find the average speed of the freight train. | |
A. | 9 [Wrong Answer] |
B. | 12 [Correct Answer] |
C. | 15 [Wrong Answer] |
D. | 24 [Wrong Answer] |