a car takes 15 minutes to travel along a road that is 20 km long . what is the average speed s of the car
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If the car travels 15km in 20 minutes, and 20 minutes are a third of an hour, so the speed per hour is : (15km * 3)/(20min * 3) = 45km/60min, as 60min is an hour so it's equal to 45km/h
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t=15*60= 900
d=20000
s=d/t
=20000/900
=2.2 m/s
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