Question 888792
A new printing press can complete the weekly edition of a news magazine in 10 hours. An older printing press requires 15 hours to do the same task. how long would it take to print the weekly with both presses operating
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let x=how long it would take to complete the job with both presses working
1/10=work rate of new printing press
1/15=work rate of older printing press
1/x=work rate with both printing presses operating
sum of individual work rates=work rate working together
1/10+1/15=1/x
3/30+2/30=1/x
5/30=1/x
x=30/5=6
how long it would take to complete the job with both presses working=6 hrs