The speeds of three cars are in the ratio of 2 : 3 : 5 find the ratio of the time taken by the above cars to travel the same distance.?

15 : 10 : 6
6 : 10 : 15
10 : 15 : 6
10 : 6 : 15

Correct Answer: 15 : 10 : 6

Explanation:

We know that speed and time are inversely proportional.
∴ Ratio of time taken = 1/2 : 1/3 : 1/5
= 30/2 : 30/3 : 30/5 [ LCM of 2, 3, 5 = 30 ]
= 15 : 10 : 6

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