14. A car travels a distance of 15 km in 20 minute
Find the speed of the car in (1) km h-!, (ii) ms
Answers
Explanation:
A car travels at a distance of 15km in 20 minutes. What is the speed of the car in km h-1 and in m s-1?
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9 Answers

Amaro Cantador, Senior Developer at NOS
Answered April 18, 2018 · Author has 155 answersand 104.6K answer views
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.
Answer:
Explanation:
Time taken = 20 minutes
(i) Speed of car in km h-1
Convert 20 minutes to hour
1 minute = 1/60 hour
∴ 20 minutes = (1 × 20)/60 = 1/3 hour
Speed of car = Distance/Time taken
= 15 km/(1/3) h
= 15 k m × 3 h -1 = 45 km h -1 = 45 km h-1
(ii) Speed of car in m s-1
Convert 15 km into metres
m
15 km = 1000 × 15 = 15000 m ……(i)
Convert minutes into seconds
1 minutes = 60 sec
20 minutes = 60 × 20 = 1200 sec ……(ii)
Speed of a car = 15000m/1200 sec
= 12.5 m s-1