vincent’s copier can print in 7 hours. chris’s printer can do the same in 13 hours. how long would it take to do the job using b
oth copiers
1 answer:
Answer:
Step-by-step explanation:
1/7+1/13=1/t
multiply both sides by 7*13*t
13t+7t=7*13
21t=91
t=91/19
it will take 4 hours and 8 minutes
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