Asked by jessica

A library crew can shelve books in six hours. Another crew can do the job in four hours. If the first crew begins and is joined by the second crew one hour later, how many hours will it take to finish the job?

Answers

Answered by Reiny
1st crew did (1/6)job
that leaves (5/6)job to be done with combined crews.

combined rate = job/6 + job/4 = 5job/12

time to do rest of job = (5/6)job รท (5job/12)
= 2 hours

It will take another 2 hours to finish
There are no AI answers yet. The ability to request AI answers is coming soon!

Related Questions