a car take 20 minutes to covera distance of 15 km . calculate its speedin km/hr
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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.
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Time taken = 20× 60 = 1200s
distance = 15 × 1000
speed =15000/1200
= 150/12 = 12.5m/s
speed = 2.5 × 18/5 km/ h
= 45 km /h....
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