helen can paint a room in 5 hrs. alone. if bill helps they take 3 hrs. how long will it take bill to paint it?

Question

i need an answer a.s.a.p. please help me!

Answer 1

6.5hrs

Answer 2

It will take Bill 5-1/2 hours to paint the room.

Answer 3

It is 7.5 as many have said.
Here's how you do it.
Helen's rate is x/5.
IN 3 hrs she does 3/5 x or 3/5 of the room.
Bill does 2/5 in 3 hrs. His rate is 2/5 divided by 3 which is 2/15.
If he goes at 2/15 of a room an hour then it will take him 15/2 hours to finish one room, which is 7.5 hours.

Answer 4

Bill can do it in 7 hrs and 30 mins.. since Helen is 150% faster than Bill.. 3hrs + 2hrs = 5hrs Helen did the 3/5 hour work in 3 hours, while Bill did the 2/5 work in 3 hours, 3/2=1.5 hence Helen is 150% faster.. 5hrs X 1.5 = 7.5hrs or 7 hours 30 mins..
hope that helps =)

Answer 5

helen can paint 1/5 of the room every hour
bill can paint 1/3 of the room every hour
together, they can paint 1/3 + 1/5 of the room an hour.
1/3 + 1/5 is 8/15.

Invert the fraction, they can paint the room in 15/8 hours.

Answer 6

HELEN CAN PAINT IN 5 HRS
IN ONE HOUR SHE CAN COMPLETE 1/5 TH OF HER WORK

BILL AND HELEN TAKE 3 HRS

IN ONE HOUR BILL AND HELEN WILL TAKE COMPLETE 1/3 OF THE WORK

SO IN ONE HOUR BILL WILL TAKE 1/3 - 1/5

LCM 15

5/15 - 3/15 = 2/15

SO IN ONE HOUR 2/15 OF WORK IS COMPLETE

1 HR --> 2/15 OF W
SO FOR W TO BE COMPLETE IT IS 15/2 I.E 7.5 HOURS

Answer 7

R1T+R2T=1
(1/5)(3)+X(3)=1
3X=2/5
X=2/15

He can paint 2 rooms in 15 hours, so he could paint one in 7.5 hours

Answer 8

1 1/2 hours.

Answer 9

If Bill is anything like my husband, it will take him 10 years to do any project on his own:)

Answer 10

1/5 + 1/x = 1/3
1/x = 2/15
x = 7.5
Pls verify the ans cos i am not sure 'bout the logic..

Answer 11

IM NOT SURE BUT I THINK ITS 2HRS. IF YOU want the accurate information go and ask dr.math online i dont know the website but im preety sure you can fing it on google.