Álgebra 2 question

Question

Kevin ran 6 miles in the time it took Michelle to run 4 miles. Kevin runs at a rate of 3 miles per hour faster than Michelle. How fast was Michelle running

Answer 1

6/K=4/M

K=M+3

6/(M+3)=4/M

6M = 4M+12

M = 6

K = 9