a train travels a distance of 20 km per/h with a uniform speed of 60 km per /h it travels another distance of 40km per/h with a uniform speed of 80 km per/h calculate the average speed of the train
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Answer:
total distance=20 +40=60km
Time 1=20/60=1/3
time 2=40/80=1/2
avg.speed=total distance/total time
=60/1/3+1/2
=72km/h
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Answer:
total distance =20+40=60
total time
time for 1 case=distance /speed
=20/60
=1/3hr
time for 2 case=
=40/80
=1/2hr
total time =1/3+1/2
=5/6hr
average speed = total distance /total time
=60÷5/6
=60×6/5
=12×6
=72 km/hr
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