Help me please hurry

Question

Two mechanics worked on a car. The first mechanic worked for 15 hours, and the second mechanic worked for 5 hours. Together they charged a total of $1875.

What was the rate charged per hour by each mechanic if the sum of the two rates was $165 per hour?

Answer 1

15F + 5S = 1875

3F +S = 375

subtract

F + S = 165

2F = 210

F = 210/2 = $105 per hour for the mechanic working 15 hours

S = 165- 105 = $60 per hour for mechanic who worked 5 hours

15(105) + 5(60) = 1575+300 = 1875