SOLUTION: Annika can do the weekly billing in 2h. Asa can do it in 3h. If Annika works for 30 min and is them joined by Asa, how long will it take them to finish?
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Question 318276: Annika can do the weekly billing in 2h. Asa can do it in 3h. If Annika works for 30 min and is them joined by Asa, how long will it take them to finish? Answer by solver91311(24713) (Show Source):
If Annika has worked for 30 minutes on a job that would take her 2 hours, then she must have of the job remaining and that balance must require Annika to work for hours. If Asa would take 3 hours to do the whole job, then she must require to to the balance of the job by herself.
Now all you have to do is apply the rule for two entities working together:
If A can do a job in x time periods, then A can do of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do of the job in 1 time period.
