A car travels 20 km in 20 minute. Find the speed of car (a) kmh-1, (b) ms-1.
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(a) if the car travels 20 km in 20 min and 20 min are 1 third of an hour ,so the speed per hour is
(20km x 3)/(20min x 3)
60km/69min
(b) 1km=1000km
20km=1000 x 20
=20000
1min =60sec
20min=60 x 20
=1200sec
speed of car=distance/time
speed of car=20000m/1200sec
=12.6ms-1
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