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1. |
A train of length 100 m travelling at 20 m/s overtakes another train of length 200 m travelling at 10 m/s. The time taken by the first train to pass the second train is |
A. | 30 s |
B. | 50 s |
C. | 10 s |
D. | 40 s |
Answer» B. 50 s | |