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We know that Sally can paint the house by herself in four hours. Put another way, she can paint 1/4 of the house in an hour. Using similar logic, we know John paints at a rate of just 1/6 of a house per hour. If we convert those fractions to fractions with a common denominator, we have 3/12 of a house for Sally and 2/12 of a house for John, so together they can paint at a rate of 5/12 of a house per hour.

But that is not yet the answer to the question.

If you take the reciprocal of 5/12 houses per hour, you get 12/5 hours per house. That equals 2.4 hours per house. Converting to hours and minutes, you get 2 hours, 24 minutes -- because 0.4 hours equals 24 minutes. (0.4 hours x 60 minutes/hour = 24 minutes.)

Algebra

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Above answer of this question is right.but we can also define it some other way, in percentage. May be this solution make esay for some friends to understand.Silly tooks 4 hors to paint 100 % (full house).Jhon tooks 6 hours to paint 100 % (Full house).In an hoursilly can paint 25 % of house & Jhon can paint 16.66 % of house, so they both can paint 41.66 percent of house in an hour.so, if we divide (total required work) / (work they can do in an Hour)= 100 / 41.66we I'll get the total time to paint complete house.ANSWERS IS : 2.4 Hours or 2 hours 24 minutes.

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12y ago
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11y ago
Answerusing the simple formula A*B/A+B regarding this type of problem we yield 24/10 or like everybody else has said 2.4 hours.AnswerSally can paint 1/4 of a house per hour.

John can paint 1/6 of a house per hour.

Let's say the answer is t hours for the total job.

Then (1/4)t + (1/6)t = 1

(1/4 + 1/6)t = 1

(6/24 + 4/24)t = 1

(10/24)t = 1

t = 24/10 hours = 2.4 hours

AnswerIf Sally can paint a house in 4 hours, then she can paint 1/4 of a house in 1 hour.

If John can paint a house in 6 hours, then he can paint 1/6 of a house in 1 hour.

Let x be the number of hours it would take them to paint the house.

Working together, they can paint 1/x of the house in one hour, so

1/4 + 1/6 = 1/x

Multiply by LCD, so 12x (1/4 + 1/6 =1/x)

3x + 2x = 12

5x = 12

x=2.4 hours. Also, 40 % of 60 minutes is 24 minutes.

Final answer = 2 hours and 24 minutes.

AnswerThe equation is this:

Multiply both sides by the LCD which is 12x:

= 2.4 hours

Answer2.4 hours AnswerThe sales price of a car is $12,590, which is 20% off the original price. What is the original price?

3 HOURS AND 2 MINUTES

2.4

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If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

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15y ago

It takes 8 days for 2 painters to paint 4 houses.

P.S: Assuming all the houses are identical in size and shape and the ability of the painters aswell. - Pradeep Reddy

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14y ago

Five hours.

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Q: If Sarah paints a room in 4 hours and sam paints the same room is 6 hours how long will it take for both to paint one room?
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