Can you help me?

1.an older computer unit requires 12min more to print a company's payroll than does a newer computer unit. Used together the computers can print the payroll in 8 min. find the time the new computer unit, used alone, will require to print the payroll.:confused:

2.working together. Dan and Leah can mow a lawn in 1 h and 12 min. Working alone, Leah can mow the lawn in 1 h less time than it would take Dan. Find the time it takes for each of them, working on his/her own, to mow the lawn.:confused:

I hope you can help me..
God bless.. :)

1. Let the no. of pages be N

Let New and Old print in x and x + 12 min

pages per min for New = N/x

Pages per min for Old = N/(x + 12)

In 8 min, new prints = 8N/x pages

Old prints 8N/(x +12)

Total pages =

N = 8N/x + 8N/(x + 12)

1 = 8/x + 8/(x +12)

Solve this equation to get x

2. Use similar method as for part 1.