Working alone, Henry takes 3 hours less than Mary to clean the carpets in the entire office. Working together, they can clean the carpets in 2 hours. How long would it take Henry to clean the office carpets if Mary were not there to help?

It would take Henry 3 hours to clean the office carpets if Mary were not there to help

Step-by-step explanation:

Assume that it takes Henry t hours to clean the carpets

∵ Henry takes 3 hours less than Mary to clean the carpets

∵ Henry takes t hours

- That means add 3 to t to find Mary time

∴ Mary takes t + 3 hours

∵ The rate of Henry is

∵ The rate of Mary is

∵ Working together, they can clean the carpets in 2 hours

- Add the two rates and equate the answer by (their rate together)

∴

Multiply the two denominators and multiply each numerator by the other denominator to add the two fractions of the left hand side

∵

∴  

- Add the two fractions in the left hand side

∴

∴  

Use the cross multiplication

∵ (t² + 3t)(1) = 2(2t + 3)

∴ t² + 3t = 4t + 6

- Subtract 4t from both sides

∴ t² - t = 6

- Subtract 6 from both sides

∴ t² - t - 6 = 0

- Factorize it into two factors

∴ (t - 3)(t + 2) = 0

Equate each factor by 0 to find t

∵ t - 3 = 0

- Add 3 to both sides

∴ t = 3

OR

∵ t + 2 = 0

- Subtract 2 from both sides

∴ t = -2 ⇒ reject this answer because there is no - ve time

∴ t = 3

∴ Henry would take 3 hours to clean the carpets alone

It would take Henry 3 hours to clean the office carpets if Mary were not there to help

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step-by-step explanation:

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