kai and juan have to get 6000 signatures on a petition. Kai can do the job alone in 17 hours, if juan helps they can get the job done in 10 hours. how long would it take juan to do the job by himself?

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?