Posted by **Jennifer** on Saturday, October 11, 2008 at 8:58pm.

Edward can paint a bedroom in 3hr. Jeb can paint the same room in 3.75 hours. How long will it take them, working together, to paint the bedroom?

- Word problem -
**Ms. Sue**, Saturday, October 11, 2008 at 9:07pm
Their average time for painting the bedroom is 3.375 hours. Working together they'd take 3.375/2 = 1.67875 hours.

- Word problem -
**Jennifer**, Saturday, October 11, 2008 at 10:35pm
This is actually a multiple choice question and the choices are:

a.)20/3 hr

b.)2/13 hr

c.)5/3 hr

d.)1.5 hr

Would the answer be c?

- Word problem -
**Jennifer**, Saturday, October 11, 2008 at 10:37pm
How did you know to take the average of 3.75 and divide it by 2?

- Word problem -
**Reiny**, Saturday, October 11, 2008 at 10:49pm
I must respectfully disagree with Ms. Sue

Edwards rate = room/3

Jeb's rate = room/3.75

their combined rate = room/3 + room/3.75

= (3.75room + 3room)/(3x3.75(

= 6.75room/11.25

so Time = room/(6.75room/11.25)

= 11.25/6.75

= 1.666... hours

I know that my answer is "very close" to Ms. Sue's, but they are not the same.

Had the two times to paint the room been more diverged, the difference in the times would have been more obvious.

This question falls in the same category as the following:

Bob drives 100 miles at 50 mph, then Steve takes over and drives the next 100 miles at 80 mph.

What was the average speed for the trip.

the temptation would be to say 65 mph since they both drove the same distance, but....

time taken by Bob = 100/50 = 2 hours

time taken by Steve = 100/80 = 1.25 hours, for a total time of 3.25 hours

so average rate = 200/3.25 = 61.5 mph

- Word problem -
**Jennifer**, Sunday, October 12, 2008 at 12:06am
This is actually a multiple choice question and the choices are:

a.)20/3 hr

b.)2/13 hr

c.)5/3 hr

d.)1.5 hr

Would the answer be c?

- Word problem -
**Reiny**, Sunday, October 12, 2008 at 12:12am
correct

5/3 = 1.6666....

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