P and Q can do a piece of work in 15 days, Q and R in $$ {22{1\over 2}}$$ days, P and R in 30 days. They all work at it for 9 days and then P leaves but Q and R go on together for 6 days more. If then Q leaves, how long will R take to complete the work?
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Q:
P and Q can do a piece of work in 15 days, Q and R in $$ {22{1\over 2}}$$ days, P and R in 30 days. They all work at it for 9 days and then P leaves but Q and R go on together for 6 days more. If then Q leaves, how long will R take to complete the work?
- 114 daysfalse
- 218 daysfalse
- 315 daystrue
- 416 daysfalse
- 512 daysfalse
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