It takes Greg 50 minueted to get to his best friends house. He spends m minuetes riding his bike to the bus stop at the rate of 2 miles per minute. He gets on the bus and travels the rest of the way at a rate of 6 miles per minute. The total distance traveled is represented by the expression 2m + 6(50-m). If Greg rides his bike for 10 minutes, how many miles did he ride?