Tom can complete 5 laps of a race track in 15 minutes. Mark can finish 10 laps in 20 minutes at a speed of 150 miles/hour. How fast is Mark driving compared to Tom?

Answer 1

Mark's time is 10 laps in 20 minutes. 20 minutes * 3 = 1 hour. 10 laps * 3 = 30 laps. Mark has the speed of 150 miles per hour. In an hour he ran 30 laps/150 miles. This means that each lap was 5 miles.

Tom ran 5 laps. 5 laps * 5 miles is 25 miles in 15 minutes. 15 * 4 = 1 hour. 25 * 4 = 100 miles. Tom runs 100 miles per hour.

Mark: 150 minus Tom: 100 miles per hour is 50. Mark is 50 miles faster than Tom.

Answer 2

Tom took 4 secs to run 6 yards, Diane ran 5 yards in 3 secs. Who would get to 30 yards first?