Question
A car covers a distance of 715 km at a constant speed . If the speed of the car would have been 10 km/hr more , then it would have taken 2 hours less to cover the same distance . What is the original speed of the car ?
Answer: Option C
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Let the original speed be `x` km/hr . Then,
`715/x - (715)/(x + 10) = 2 hArr 2x(x + 10) = 7150 hArr x^2 + 10x - 3575 = 0`
`hArr (x + 65) (x - 55) = 0 hArr x `= 55 kh/hr.
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