Jamie has a job paying $25,000 and expects to receive a $1000 raise each year. wei has a job paying $19,000 a year and expects a $1500 raise each year. for what span of time is jamie making more money than wei?

Jamie get's $10,000 dollars added onto her annual paycheck after 10 years.
Wei on the other hand, get's $15,000 dollars added onto his annual paycheck after 10 years.
Jamie's total: $35,000
Wei's total: $34,000 
So Jamie would have a better pay than Wei for 10 years, but after that Wei will take the lead. 

The first one is 2/3the second is 1/160the third is 4/125