Question

Two trains, whose respective lengths are 120 metres and 180 metres, cross each other in 15 seconds when they are moving in opposite directions and in 50 seconds when they are moving in the same direction. What is the speed of the faster train (in km/hr)?

A 46.8 kmph
B 40.2 kmph
C 54 kmph
D 56.5 kmph
E None of these
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