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Sindrei [870]
3 years ago
8

Betty can mow a lawn in 60 minutes. Melissa can mow the same lawn in 30 minutes. How long does it take for both Betty and Meliss

a to mow the lawn if they are working together? Express your answer as a reduced fraction.
Mathematics
1 answer:
Andrews [41]3 years ago
7 0

Answer:

  20 minutes

Step-by-step explanation:

Melissa works as fast as two Bettys, so working together, they get the job done at the rate 3 Bettys could do it. That time is (60 minutes)/3 = 20 minutes.

Working together, Betty and Melissa can mow the lawn in 20 minutes.

_____

You can also think in terms of mowing rates as lawns per minute. The total mowing rate is ...

  Betty's rate + Melissa's rate = (1/60 lawns/min) +(1/30 lawns/min)

  = (1/60 +2/60) lawns/min = 1/20 lawns/min

The inverse rate is then ...

  20/1 min/lawn

Together, they take 20 minutes to mow 1 lawn.

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(10 POINTS AND BRAINLIEST)
bekas [8.4K]

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Step-by-step explanation:

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Me i go thru each one and solve for x

lucky for me i just need to solve one

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