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A dog takes 7 jumps for every 10 jumps o...

A dog takes 7 jumps for every 10 jumps of the loin and a fox takes 12 jumps for every 10 jumps of the lion and the distance covered by dog in 5 jumps , distance covered by lion in 15 jumps and the distance covered by fox in 20 jumps is equal .find the ratio of their speeds .

A

`9 : 21 : 10`

B

`21 : 10 : 9`

C

`7 : 13 : 17`

D

`9 : 10 : 21`

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