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A car did a journey in t hours. Had the ...

A car did a journey in t hours. Had the average speed been x kmph greater, the journey would have taken y hours less. How long was the journey ?

A

`x ( t -y) ty`

B

`x ( t -y) ty^(-1)`

C

`x ( t -y) ty^(-2)`

D

`x ( t +y) ty`

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