Question

Train ‘A’ travelling with a speed of 84 km/h can cross a pole in 12 seconds. If the length of train ‘B’ is 20% less than that of train ‘A’ and it can cross a pole in 21 seconds then speed (in km/h) of train ‘B’ is:

A 37.4 km/h
B 32.4 km/h
C 38.4 km/h
D 31.4 km/h
E None of these
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