Problema Solution
The rain publishing company has to printing presses. It takes a new printing press 45 minutes to print 10,000 flyers. Together it takes the two presses can print the 10,000 flyers in 30 minutes. How long does it take the older printing press by itself to print the 10,000 flyers.
Answer provided by our tutors
New: 45 mins -> 10,000 flyers -> 10,000/45 = 222.22 flyers/mins
Old : x mins -> 10,000 flyers -> 10,000/x flyers/mins
Both: 30 mins -> 10,000 flyers
=> (222.22 + 10,000/x) * 30 = 10,000
=> 6,666.6 + 300,000/x = 10,000
=> 300,000/x = 3,333.4
=> x = 300,000/ 3,333.4 = 90 mins