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Speed of a car is (v + 3) km/h, which is 10 km/h less than that of bike. Time taken by car to cover 84 km is 25% less than the time taken by bike to cover 168 km. Length of a train is (5v + 11) metres. If speed of train is (v - 5) m/s, then find the time taken (in seconds) by train to cross a man standing on a platform of length 420 metres.

A 6

B 9

C 12

D 10

E 8

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