2006-09-04 13:43:38 · 14 answers · asked by tgifrichard 1 in Education & Reference ➔ Primary & Secondary Education
1/total= 1/sara's time + 1/mike's time
1/t= 1/2 + 1/4
1/t = 3/4
t = 4/3 = 1 1/3 hours = 1 hour 20 minutes
2006-09-04 13:48:44 · answer #1 · answered by Goddess of Grammar 7 · 0⤊ 0⤋
AlpineAlli is right. Sara can paint half the fence in an hour and Mike can paint 1/4 of it in an hour, for a total of 3/4 in an hour, or 1/4 in 20 minutes. So 80 minutes are needed.
2006-09-04 13:51:59 · answer #2 · answered by hayharbr 7 · 0⤊ 0⤋
Depends on how good mike and sara are at painting, the fence could look like crap in an hour if Mike does a good paint job, and sara doesn't... Mike or Sara should just paint the fence on their own...
2006-09-04 13:54:25 · answer #3 · answered by Bensalem Strangler 2 · 0⤊ 0⤋
It would take them three hours, because working together, Sara would take an hour to paint half the fence, while Mike would take 2 hours to paint the other half.
2006-09-04 14:03:24 · answer #4 · answered by Ashley B 2 · 0⤊ 0⤋
Reworded: Sally can paint a million/4 of a house in an hour, and John can paint a million/6 of the comparable abode in an hour. enable T = the quantity of time it takes via each and every contribuing: a million/4 T + a million/6 T = a million 3/12 T + 2/12 T = a million 5/12 T = a million T = 12/5 2 hours 24 minutes
2016-10-01 07:52:28 · answer #5 · answered by ? 4 · 0⤊ 0⤋
3 hours
2006-09-04 13:47:27 · answer #6 · answered by kaindragon 4 · 0⤊ 0⤋
2 plus 4 divided by 2.
(2 + 4 = ) 6 `/. 2 = 3
2006-09-04 13:48:59 · answer #7 · answered by ASLotaku 5 · 0⤊ 0⤋
Do they know how to paint a fence?
2006-09-04 13:50:25 · answer #8 · answered by Mr. KnowItAll 1 · 0⤊ 0⤋
Well that's simple! 4-2=2. Cause they r working together.
2006-09-04 13:51:37 · answer #9 · answered by Jordan 2 · 0⤊ 0⤋
About three hours.
2006-09-04 13:52:13 · answer #10 · answered by no nickname 6 · 0⤊ 0⤋