A car has cover a distance of 10 km. It covers a distance of first 4km at a speed of 40km/h. How fast should the car travel while covering the remaining distance, so that its average speed for the entire trip is 60km/h?
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Total distance to be covered = 10 km
Target average speed = 60 km/h
Hence, target travel time = 10 minutes
Time used to cover the first 4 km at 40 km/h = 6 minutes
Time left to cover the remaining 6 km = 4 minutes
Target speed for the remaining 6 km = 6/4 km/min or 90 km/h
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