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1. |
Two trains 121 m long and 99 m long are running in opposite direction, first at 40 km/h and the second at 32 km/h. In what time will they completely clear off each other from the moment they meet ? |
A. | 10 s |
B. | 11 s |
C. | 13 s |
D. | 14 s |
Answer» C. 13 s | |