A car travels a distance of 15 km in 20 minute
Find the speed of the car in (1) km h^-1. (ii) m s^-1
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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. Same way an hour has 3600 seconds so the speed for second is: (45km / 3600)/(1h / 3600) = 0.0125km/1s = 12.5m/s. I hope I could help.
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