SOLUTION: alice can do a job in 4 hours, christina can do the same job in 5 hours. how long would it take if they work togehter
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Question 1055665: alice can do a job in 4 hours, christina can do the same job in 5 hours. how long would it take if they work togehter Answer by ikleyn(52814) (Show Source):
Read it attentively and then solve your problem by substituting your data.
In couple lines, the solution is
= =
is the combined rate of work of A and C working together.
It means that they both can complete the job in hours.
For details see the lesson above.
