Asked by Jessica

it takes beth 6 hours to do homework and it takes nina 9 hours. how many hours would it take if they did their homework together?
Answered by Don
find the average of hours of homework completion.

(6+9)/2 = 7.5 hours
Answered by Reiny
If they have to do their OWN homework, then the question really makes no sense.
If it is an assignment type homework were both can work on the project, then

beth's rate = 1/6
nina's rate = 1/9
combined rate = 1/6 + 1/9 = 5/18
time at combined rate = 1/(5/18)
= 18/5 or 3.6 hrs
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