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The ratio of speed of X and Y is 5 : 7 Y...

The ratio of speed of X and Y is `5 : 7` Y covers distance of 420 km in 3 h. What is the speed of X?

A

`80 km//h`

B

`90 km//h`

C

`100 km//h`

D

120 `km//h`

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