A car covers three successive 4 km distances at the speed of 10kmph, 20kmph and 60 kmph respectively. its average speed forthe total distance is:
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Time taken to travel first 4 km = distance/speed =4/10= 0.4 hr
Time taken to travel next 4 km = 4/20= 0.2 hr
time taken to travel next 4 km = 4/60 = 0.067 hr
Average speed = total distance travelled/ total time taken to travel that distance
= 12/ 0.667 = 17.991 kmph or 18 kmph = 18*(5/18) m/s = 5 m/s
Time taken to travel next 4 km = 4/20= 0.2 hr
time taken to travel next 4 km = 4/60 = 0.067 hr
Average speed = total distance travelled/ total time taken to travel that distance
= 12/ 0.667 = 17.991 kmph or 18 kmph = 18*(5/18) m/s = 5 m/s
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