The speeds of three cars are in the ratio of 2 : 3 : 5 find

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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.?

1. 15 : 10 : 6
2. 6 : 10 : 15
3. 10 : 15 : 6
4. 10 : 6 : 15

Correct Option: A

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