a scooter covers 20km/h at a uniform speed of 30km/h what should be its speed for the next 40 km if the average speed is 60km/h

Total distance travelled by the car = 20 km + 40 km = 60 km

speed by which first 20 km is covered = 30 km/hrtime taken to cover first 20 km = distance speed = 2030 = 23 hr.Let v be the speed of car to cover next 40 km.Time taken to cover next 40 km = distancespeed = 40v hr.Average speed = 60 km/hrtotal distance travelledtotal time taken= 606023 + 40v = 60602v + 1203v = 6060 × 3v2v + 120 = 603v = 2v + 120v = 120 km/hr

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