three postal workers can sort a stack of mail in 30 minutes, 30 minutes, and 60 minutes, respectively. find how long it takes th
em to sort the mail if all three work together.
2 answers:
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
Answer:
it will take about 1/3 of the time (10 minutes)
Step-by-step explanation:
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