SOLUTION: "A mother can rake a yard in 90 minutes and her daughter can do it in 60 minutes.If the mother rakes for 15 minutes before her daughter joins her,how long will it take them to fin

Question 935161: "A mother can rake a yard in 90 minutes and her daughter can do it in 60 minutes.If the mother rakes for 15 minutes before her daughter joins her,how long will it take them to finish the work?"
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
Mother rate, 1/90 yards per minute.
Daughter rate, 1/60 yards per minute.
t, time for combined Mother and Daughter raking together, to finish...

, for ONE JOB.

LCD is .

, MINUTES together to finish after Mother works for 15 minutes alone.

RELATED QUESTIONS
Phyllis can rake our lawn in 50 minutes and I can do it in 40 minutes. If she rakes for... (answered by stanbon,macston)

Andrea can rake her Dad's yard in 45 minutes. Andrea's brother Bradford rakes one and... (answered by ptaylor,nerdybill,Alan3354)

Alan can rake leaves in a yard in 12 minutes. Barry can rake the same yard in 10 minutes (answered by richwmiller)

Nancy takes an hour and a half to rake the lawn. But it takes her only 40 minutes if her... (answered by stanbon)

John can rake his yard in 40 minutes, his brother Bob can rake the yard in one hour, how... (answered by stanbon)

Ingrid can rake our lawn in 90 min ad I can do it in 60 min. If she rakes for 15 min... (answered by ankor@dixie-net.com)

If Louis can rake leaves off a lawn in 58 minutes, and Ron can do the same job in 35... (answered by stanbon)

A mother jogs at the same rate of 4.5 mph and her daughter jogs at a rate of 5 mph. The... (answered by checkley71)

Can you please help me set up a formula for figuring out how long it would take two... (answered by ankor@dixie-net.com)