Question 1019913
Matt will be at the starting line the following no. of seconds after the start
50 100 150 200 250 300 350 400 450
Dan will be at the starting line at
80 160 240 320 400 480
Notice that the first time both will cross at the same time is after 400 seconds.
At that time Matt will have completed 8 laps and Dan will have completed 5 laps.