two mechanic work on a car. 1st mechanic worked 10 hrs. second worked 15 hrs. together they charged $1950 what was the rate charged per hour by each mechanic of the sum of the two rates was $155 per hour?

Solution:

First rate: x

Second rate: 155-x

So

10x+15(155-x)=1950

x = 75

So first mechanic charged $75 per hour and second $80 per hour