a car travels 30km at a speed of 15km per hour,second 30km at a speed of 20km per hour and last 30km at a speed of 25 km per hour.find the average speed of car.
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t1= 30/15=2hrs
t2= 30/20= 1.5hrs
t3= 30/25= 1.2hrs
avg speed= total distance/total time
= 90/(2+1.5+1.2)
=90/4.7
= 19.148 km/hr
twinklejohnt:
thanks
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