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
2 answers:
Answer:
D
Step-by-step explanation:
for 8hours A=6720
for 8hours B=6080
Therefore total is 6720+6080=12800
Answer: 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
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Step-by-step explanation:
