A motor starts with the speed of 70 kmph with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 km? ?->(Show Answer!)

1. A motor starts with the speed of 70 kmph with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 km?

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By: anil on 05 May 2019 01.34 am

Distance = Speed $$ imes$$ Time Initial speed = 70 kmph In first 2 hours, motor covers a distance = $$70 imes 2 = 140~km$$ Speed after 2 hours = 70 + 10 = 80 kmph In the next 2 hours, it covers a distance = $$80 imes 2 = 160~km$$ Distance covered = 300 km Now, the speed is 90 kmph Remaining 45 km is covered in $$frac{45}{90}$$ = 0.5 hr Total time taken to cover 345 km = 2 + 2 + 0.5 = 4.5 hr

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