7. A car covers a distance in 30 minutes with an average speed of 60 km per hour.
What should be the average speed of the car to cover the same distance in
20 minutes ?
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Answer:
Distance = 60 km/h * 1/2 h
= 30 km
Average speed = 30 km/20 min
= 30km /20/60h
= 30km/1/3h
= 30km*3h
= 90km/h
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