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A person covers a certain distance at a certain speed. If he increases his speed by 50% then he takes 15 minutes less to cover the same distance. Find the time taken by him to cover the distance at the original speed.

A.	45 min	B.	30 min
C.	22.5 min	D.	indeterminate

Answer and Explanation

Answer:45 min

Explanation:
Speed is inversely proportional to time, i.e. Speed α 1 / time
If the speed increases to 3/2 times the normal speed, then the time decreases to 2/3 times the original time
1/3 of original time = 15 min
Original time = 3 × 15 = 45 min

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