Time & distance

Quantitative Aptitude (CDS)

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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 less than before. The original speed of the car was

45 km/hour

50 km/hour

60 km/hour

75 km/hour

Explanation:

Let the original speed of the car be x km/hr. Time taken by the person at the original speed - Time taken by the person at the increased speed = 1 hr
∴300/x -300/(x+15)=1
⇒4500/x(x+15)=1
⇒x²+15x−4500=0
⇒(x+75)(x−60)=0
⇒x=60km/hr (since speed cannot be negative)

By: Munesh Kumari

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