By increasing the speed of his car by 15 km hour a person covers 300 km distance by taking an hour l...........

Quantitative Aptitude (CDS) Time & distance

By increasing the speed of his car by 15 km/hour,a person covers 300 km distance by taking an hour less than before. The original speed of the car was

45 km/ hour

50 km/hour

60 km/hour

75 km/ hour

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Explanation:

Let the original speed of car be = x km/hour
300/x−30(x+15)= 1
⇒x+15−x/(x+15)x=1/300
⇒x² + 15x − 4500 = 0
⇒(x + 75) (x − 60) = 0
x ≠ −75 => x = 60

By: Munesh Kumari

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By increasing the speed of his car by 15 km hour a person covers 300 km distance by taking an hour l...........

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