a car travel 30km at uniform sped of 40km/hr and next 30 km at a uniform speed of 20km/hr find its average speed.
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time taken to travel 30km = distance/speed
30/40 = 3/4 hrs
time taken to travel next 30 km = 30/20=
3/2hrs
total time = 3/2+3/4 = 9/4 hrs
average speed = total distance travelled /total time taken
=60÷9/4 that is 80/3 = 26.67 km/hr
30/40 = 3/4 hrs
time taken to travel next 30 km = 30/20=
3/2hrs
total time = 3/2+3/4 = 9/4 hrs
average speed = total distance travelled /total time taken
=60÷9/4 that is 80/3 = 26.67 km/hr
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