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
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total distance=75km/h
total time taken=20min
average speed=d/t
=75/20
=>3.75 km/hr
total distance=75km/h
total time taken=20min
average speed=d/t
=75/20
=>3.75 km/hr
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