It takes a runner 8 minutes to run 5 laps of a 400 m track. How many minutes will it take the runner, running at the same speed, to complete 9 laps of 200 m track?
+36916 8 minutes / (5x400)m = .004 min / meter
.004 min/meter * (9 * 200 meters) = 7.2 mins
