a car travels with a speed of 60kmh-1 for 20 minutes and then with a speed of 40kmh-1 for 15 minutes. find the average speed.
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Answer:
Car moves with a speed of 40km/h for 15 minutes then with a speed of 60 km/h for next 15 minutes.find the total distance covered by the car in these 30 minutes.
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51.42 kmph
Explanation:
average speed = total distance/total time
20 mins = 1/3hr
15 mins = 1/4 hr
so,
60kmph for 1/3 hr = 20km
40kmph for 1/4 hr = 10km
=>. 30/( 7/12)
360/7 kmph
51.42kmph
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