For first 1 h a train runs with speed 60 km/h, and for nexth train runs with speed 40 km/h. The average speed of train for whole journey is ?
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EXPLANATION
Speed for 1st hr=60km/hr.
Speed for half hr=40km/hr.
Distance in 1st hr.=60km
Distance in next half hour=20km
Total distance=80km
total time=90mins.
Average Speed=total distance/total time
80km/90/60hr
=160/3km/hr
=53.33km/hr.
ANSWER: 53.33 km/hr.
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