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Question
A car travels a distance of 15 km in 20 minute. Find the speed of the car in m s-1.
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Solution
Distance travelled by car =15 km
Time taken = 20 minutes
Speed of car in `"m s"^-1`
Convert 15 km into metres
1 km = 1000 m
15 km = 1000 × 15 = 15000 m
Convert minutes into seconds
1 minutes = 60 sec..
20 minutes = 60 × 20 = 1200 sec
Speed of car = `(15000 "m") / (1200 "sec")`
= 12.5 m `"s"^-1`
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