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A boy is running at a speed of p kmph...

A boy is running at a speed of `p` kmph to cover a distance of 1 km. but ,m due to the slippery ground, his speed is reduced by `q` kmph (`p > q` ) . if he takes `r` hours to cover the distance then `1/r=p-q` b. `r=p-q` c.`1/r=p+q` d. `r=p+q`

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