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maehardy4134
26.10.2019 •
Mathematics
Machine a can sort 840 pieces of mail per hour, and machine b can sort 760 pieces per hour. how long will it take both machines running at the same time to sort 12,800 pieces of mail?
a) 4 hours
b) 6 hours
c) 7 hours
d) 8 hours
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Ответ:
D) 8 hours
Step-by-step explanation:
Machine A: 840 an hour
Machine B: 760 an hour
h = hour
840 + 760 = 1600
In an hour, they can both sort 1600 mails.
1600h = 12800
Divide each side by 1600
h = 8
840 * 8 = 6720
760 * 8 = 6080
6720 + 6080 = 12,800
Ответ:
4 cents
Step-by-step explanation:
4.50 divide by is .9 and 7.52 divide by 8 is .94