Question
A motor car starts with the speed of 70 km/hr with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 kms.?
Answer: Option C
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Distance covered in first 2 hours = (70 x 2) km = 140 km.
Distance covered in next 2 hours = (80 x 2) m = 160 km.
Remaining distance = 345 - (140 + 160) = 45 m.
Speed in the fifth hour = 90 km/hr.
Time taken to cover 45 km = ` (45/90)hr = 1/2 hr`
`:.` Total time taken =` (2 + 2 +1/2) `= `4 1/2` hr.
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