Don L. answered • 11/14/18

Fifteen years teaching and tutoring basic math skills and algebra

Hi Scott, let x represent the number of hours Jim rode his bike at 30 miles per hour. That means Jim walked for 9 - x hours. Set up an equation that represents the total time.

30 * x + 4 * (9 - x) = 205

30x + 36 - 4x = 205

26x = 169

x = 6.5

Jim rode his bike for 6.5 hours and waked for 2.5 hours.

Check:

30 * 6.5 + 4 * (9 - 6.5) = 205

30 * 6.5 + 4 * 2.5 = 205

195 + 10 = 205

205 = 205

Questions?