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Alecsey [184]
2 years ago
6

Jannette can repair a refrigerator in 60 minutes. Liza can repair a refrigerator 20 minutes faster. If they work together, how m

any minutes does it take them to repair the refrigerator
Mathematics
2 answers:
Rama09 [41]2 years ago
6 0
24 minutes. Assuming that 2 people who will repair a refrigerator equally fast will do it twice as fast when working together:
Jannete repairs 1/60 refrigerator per minute.
Lisa repairs 1/40 refrigerator per minute.
Togheter they repair 1/60+1/40= 1/60 + 1,5/60 = 2,5/60=5/120=1/24 refrigerator per minute
thus it will take them 24 minutes
Elena L [17]2 years ago
3 0

Answer:

It takes 15 minutes them to repair the refrigerator

Step-by-step explanation:

Let repairing refrigerator be x.

Jannette can repair a refrigerator in 60 minutes.

Rate at which Jannette can repair a refrigerator  =\frac{x}{60}

Rate at which Liza can repair a refrigerator  =\frac{x}{20}

If they combine time required =\frac{x}{\frac{x}{60}+\frac{x}{20}}=15\texttt{minutes}

It takes 15 minutes them to repair the refrigerator

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