## p and q need 8 days to complete a work. q and r need 12 days to complete the same work. but p, q and r together can finish it in 6 days. how many days will be needed if p and r together do it?

p and q need 8 days to complete a work. q and r need 12 days to complete the same work. but p, q and r together can finish it in 6 days.

8 | |

7 | |

9 | |

10 |