Two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 15 hours. Together they charged a total of $1800. What was the rate charged per hour by each mechanic if the sum of the two rates was $135 per hour? Note that the ALEKS graphing calculator can be used to make computations easier. First mechanic: $ per hour Second mechanic: $ per hour 5 5 ?