Question

Two trains ‘D’ and ‘E’ of lengths 660 metres and 440 metres respectively are travelling towards each other. Ratio of speed of ‘D’ to ‘E’ is 3:2. If the trains take 55 seconds to cross each other from the time they meet, then find the average of speeds (in km/h) of trains ‘D’ and ‘E’.

A 27 km/h
B 31 km/h
C 36 km/h
D 45 km/h
E 51 km/h
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