Question

A car takes 20 minutes to cover a distance of 15 km. calculate its speed in kilometers per hour and metre per second​

Answer 1

Step-by-step explanation:

speed=distance/time

= 15km/20min

=15/20/60

=15×60/20

=45 km/hr

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Answer 2

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.

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