A motorist travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is :
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time taken while going=150/50=3hrs
time taken while coming =150/30=5hrs
total time=8hrs
total distance =300km
average speed=total distance/total time
=300/8
=37.5km/hr
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