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Train 'C' can cross a pole in 6 seconds and a 120 metres long bridge in 10 seconds. Train 'D' whose length is 25% of the length of train 'C' runs in the same direction of train 'C'. If train 'D' crosses train 'C' in 15 seconds, then find the speed of train 'D'.

A 40 m/s

B 42 m/s

C 45 m/s

D 48 m/s

E 50 m/s

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