A motor starts with the speed of 70 km hr with its speed increasing every two hours by 10 km h...........

Quantitative Aptitude ( CCS) Time & distance

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

2.25 hrs.

4.5 hrs.

4 hours 5 minutes

Can't be determined

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Explanation:

Distance covered in first 2 hours = (70 x 2) km = 140 km
Distance covered in next 2 hours = (80 x 2) km = 160 km
Remaining distance = 345 – (140 + 160) = 45 km.
Speed in the fifth hour = 90 km/hr
Time taken to cover 45 km =(45/90) hr = (1/2) hr
Therefore Total time taken = 2 + 2 + (1/2) = 4.5 hrs