A train moves with a speed of 30 kmph for 12 minutes and for next 8 minutes at a speed of 45 kmph Fi...........

A train moves with a speed of 30 kmph for 12 minutes and for next 8 minutes at a speed of 45 kmph. Find the average speed of the train?

37.5 kmph

36 kmph

48 kmph

30 kmph

Distance = Speed ×Time

Distance covered by train with thespeed of 30 kmph in 12 minutes is = 30×12/60=6km

Distance covered by the same trainwith the speed of 45 kmph in 8 minutes is = 45×8/60=6km

Average speed = total distance/total time.⇒(6+6)km/(12+8)min=12/20×60 = 36 kmph

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ANSWER IS 37.5