SOLUTION: After a snowstorm ken and beteena clear their drive way. ken can clear the snow by himself in four hours beteena can clear the snow in five.after beteena has been working for two h

Question 732453: After a snowstorm ken and beteena clear their drive way. ken can clear the snow by himself in four hours beteena can clear the snow in five.after beteena has been working for two hours ken is able to join her. how much longer will it take them working together to remove the rest of the snow?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Beteena can clear the snow in five hrs.
In 2 hrs, working alone, she can clear
of the driveway.
That means is left to clear.
---------------------
Add their rates of working to get rate
working together.
( 1 driveway / 4 hrs ) + ( 1 driveway / 5 hrs ) = ( 3/5 d.w. / t hrs )

Multiply both sides by

1 hr plus 1/3 of an hr is
1 hr and 20 min
---------------
check:

OK
RELATED QUESTIONS
Can you help me solve this? Following a severe snowstorm, Ken and Bettina Reeves... (answered by fractalier)

julie paints a house in 4 hours and ken paints the same house in 5 hours. If julie and... (answered by tommyt3rd)

Working together, Joe and David can clear snow from the city streets in 20 hours. working (answered by josgarithmetic)

Working alone, Joe can paint the room in 6 hours. If Manny helps, then together they can... (answered by macston)

Ken and Ted can produce 1 chair in 3 hours working together at their respective constant... (answered by josmiceli)

Kathy and Ken work in a textbook warehouse. Kathy can fill an order of 100 books in 40... (answered by vleith)

Kathy and Ken work in a textbook warehouse. Kathy can fill an order of 100 books in 40... (answered by Alan3354)

It takes Bob four hours longer to repair a car than it takes Ken. Working together, they... (answered by richwmiller,phal79)

David can do a job in 15 days while ken can do the same job in 10 days.If both started... (answered by josmiceli)