Simultaneously 35163

One vending machine closes 60 jars per minute, the other 20 bottles less simultaneously. In how many minutes will both machines close 900 bottles if they are put into operation simultaneously?

Correct answer:

t =  9 min

Step-by-step explanation:

a=60 1/min b=a20=6020=40 1/min  t=900/(a+b)=900/(60+40)=9 min



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