4 6. A cor takes 20 minutes to cover a distance 15 km. calculate its speed in km/h? =
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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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