Wo 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 $2725 . what was the rate charged per hour by each mechanic if the sum of the two rates was $220 per hour?

Find the cost of the first 10 hours:

10 hours = $220 x 10
10 hours = $2200


Find the cost of the next 5 hours (only the second mechanic worked):

5 hours  = $2725 - $2200 
5 hours = $525


Hourly charge of the second mechanic:

5 hours = $525
1 hour = $525 ÷ 5
1 hour = $105


Hourly charge of the first mechanic:

$220 - $105 = $115


First mechanic = $115/hour ; Second mechanic = $105/hour