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If Lisa were to paint her living room alone, it would take 3 hours. Her sister Rachel could do the job in 4 hours. How many hours would it take them working together? Express your answer as a fraction reduced to lowest terms, if needed.

Respuesta :

mhanifa

Answer:

  • 12/7 hours

Step-by-step explanation:

Lisa's rate is 1/3 of job per hour

Rachel's rate is 1/4 of job per hour

Their rate if worked together:

  • 1/3 + 1/4 = 4/12 + 3/12 = 7/12 per hour

Job will be done in:

  • 1 : (7/12) = 12/7 hours
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