A car moves through 20 km at a speed of 40 km/h, and the next 20 km at a speed of 60
km/h. calculate its average speed.
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time =distance/speed
case 1. 20/40=1/2 hr
case 2. 20/60=1/3 hr
avg speed=60/(1/2 + 1/3)
=60/(5/6)
60×6/5
=72 km/hr
case 1. 20/40=1/2 hr
case 2. 20/60=1/3 hr
avg speed=60/(1/2 + 1/3)
=60/(5/6)
60×6/5
=72 km/hr
sabrina789:
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