find the average of hours of homework completion.
(6+9)/2 = 7.5 hours
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?
2 answers
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
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
1 answer