find out the average speed of a car which covers half of the distance by speed 80 km per hour and the other half by 60 km per hour
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let the distance be x.
speed=80km/h
time=x/2/80=40x
again,
speed=60km/h
time=x/2/60=30x
total time=40x+30x=70x
So,
Average speed=x/70x=1/70 km/h or 0.0143 km/h
speed=80km/h
time=x/2/80=40x
again,
speed=60km/h
time=x/2/60=30x
total time=40x+30x=70x
So,
Average speed=x/70x=1/70 km/h or 0.0143 km/h
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