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three postal workers can sort a stack of mail in 30 minutes, 30 minutes, and 60 minutes, respectively. find how long it takes them to sort the mail if all three work together.

Respuesta :

kavarcak

Answer:

it will take about 1/3 of the time (10 minutes)

Step-by-step explanation:

irspow

Answer:

Step-by-step explanation:

t/30+t/30+t/60=1

2t/60+2t/60+t/60=1

5t/60=1

5t=60

t=12 minutes

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