Question

Train ‘A’ can cross a pole in 10 seconds and a 140 metre long platform in 12 seconds. If the ratio of length of train ‘A’ and train ‘B’ is 2:5, respectively, then find the time taken by train ‘B’ to cross a pole with a speed of 20 m/s.

A 80.5 second
B 77.5 second
C 87.5 second
D 97.5 second
E None of these
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