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Train ‘A’ running with a speed of 54 km/hr. can cross a standing goods train of 4 times its length in 20 seconds. Find the time taken by 240 meters long train ‘B’ which is coming from the opposite direction of train ‘A’, with a speed of 9 m/s, to cross-train ‘A’.

A 12.5 sec

B 7.5sec

C 18sec

D 14.5sec

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