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A and B start to walk from point P towar...

A and B start to walk from point P towards point Q. The distance between P and Q is 9 km. B starts 4 minutes after A. A, on reaching Q, immediately returns and after walking a kilometre meets B. If A's speed is a kilometre in 10 minutes. What is B's speed in kilometres per minute?

A

`1//15`

B

`1//12`

C

`1//8`

D

`1//6`

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