What is the ratio of the bikes’ time taken to cover the same distance if the speeds of 3 bikes are in the ratio 3 ∶ 5 ∶ 7? 

1
35 ∶ 21 ∶ 15
2
35 ∶ 21 ∶ 20
3
42 ∶ 55 ∶ 63
4
21 ∶ 35 ∶ 20

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