A train moves with a speed of 30 km/hr for 12 minutes and for next 8 minutes at a speed of 45 km/hr. the average speed of the train is:

1:

37.5 km/hr

2:

48 km/hr

3:

30 km/hr

4:

None of these

5:

36 km/hr

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RBI Assistant Prelims 2016

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