Question

The length of Train X is two-thirds the length of Train Y. The speeds of Train X and Train Y are 90 km/h and 72 km/h respectively. If they cross each other in 20 seconds while travelling in opposite directions, find the time taken by Train Y to cross a tunnel of length 400 metres.

A 35 seconds
B 40 seconds
C 42 seconds
D 45 seconds
E 47 seconds
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