Question

When running a half marathon (13.1 miles), it took Mark 6 minutes to run from mile marker 1 to mile marker 2, and 20 minutes to run from mile marker 2 to mile marker 4. How long did it take Mark to run from mile marker 1 to mile marker 4? 14/3 minutes 14 3 = 4.666666666666667. What was Mark's average speed as he ran from mile marker 1 to mile marker 4? miles per minute 71 minutes after starting the race, Mark passed mile marker 9. To complete the race in 110 minutes, what must Mark's average speed be as he travels from mile marker 9 to the finish line? miles per minute

Answer 1

From mile marker 1 to mile marker 4 26 minutes

The average speed was 0,115 miles/minute

From mile marker 9 to finish the race average speed was 0,105 miles/minute

Explanation:

Mark took 6 minutes from marker 1 to marker 2 ( 1 mile in 6 minutes)

and 20 minutes from marker 2 to marker 4 ( 2 miles in 20 minutes )

Then Mark took 26 minutes to get to marker 4 from marker 1 ( 3 miles)

then average speed is 3 / 26 = 0,115 miles/minute

71 minutes after starting the race Mark passed marker 9

Average speed 9 / 71 = 0,126 miles/minute

Mark complete the race in 110 minutes

Then Mark run 4,1 miles ( 13,1 - 9 = 4.1 ) from marker 9 to the end in 110 - 71 = 39 minutes at the average speed of 4,1 /39 miles /minute

4,1 / 39 = 0,105 miles/minute