Hannah can paint a room in 15 hours. Destiny can paint the same room in 9 hours. How long does it take for both Hannah and Destiny to paint the room it they are working together. hours

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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### Collaborative Work Calculation

#### Problem Description:
Hannah can paint a room in 15 hours. Destiny can paint the same room in 9 hours. How long does it take for both Hannah and Destiny to paint the room if they are working together?

#### Solution:

Step-by-Step Explanation:
1. **Determine Each Person's Work Rate**:
    - Hannah's work rate: \( \frac{1 \text{ room}}{15 \text{ hours}} = \frac{1}{15} \) (rooms per hour)
    - Destiny's work rate: \( \frac{1 \text{ room}}{9 \text{ hours}} = \frac{1}{9} \) (rooms per hour)

2. **Combine Their Work Rates**:
    - Combined work rate: \( \frac{1}{15} + \frac{1}{9} \)

3. **Find a Common Denominator for Adding Fractions**:
    - Common denominator for 15 and 9 is 45:
      \[ \frac{1}{15} = \frac{3}{45} \]
      \[ \frac{1}{9} = \frac{5}{45} \]

4. **Add the Fractions**:
    - \( \frac{3}{45} + \frac{5}{45} = \frac{8}{45} \) (rooms per hour as a combined rate)

5. **Determine Time by Taking the Reciprocal**:
    - Time taken: \( \frac{45}{8} \) hours

6. **Simplify if Possible**:
    - \( \frac{45}{8} = 5.625 \) hours

Therefore, it will take both Hannah and Destiny approximately 5.625 hours to paint the room together.

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Transcribed Image Text:### Collaborative Work Calculation #### Problem Description: Hannah can paint a room in 15 hours. Destiny can paint the same room in 9 hours. How long does it take for both Hannah and Destiny to paint the room if they are working together? #### Solution: Step-by-Step Explanation: 1. **Determine Each Person's Work Rate**: - Hannah's work rate: \( \frac{1 \text{ room}}{15 \text{ hours}} = \frac{1}{15} \) (rooms per hour) - Destiny's work rate: \( \frac{1 \text{ room}}{9 \text{ hours}} = \frac{1}{9} \) (rooms per hour) 2. **Combine Their Work Rates**: - Combined work rate: \( \frac{1}{15} + \frac{1}{9} \) 3. **Find a Common Denominator for Adding Fractions**: - Common denominator for 15 and 9 is 45: \[ \frac{1}{15} = \frac{3}{45} \] \[ \frac{1}{9} = \frac{5}{45} \] 4. **Add the Fractions**: - \( \frac{3}{45} + \frac{5}{45} = \frac{8}{45} \) (rooms per hour as a combined rate) 5. **Determine Time by Taking the Reciprocal**: - Time taken: \( \frac{45}{8} \) hours 6. **Simplify if Possible**: - \( \frac{45}{8} = 5.625 \) hours Therefore, it will take both Hannah and Destiny approximately 5.625 hours to paint the room together. ##### Input Box for Answer: [Input Box] hours
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