Coach Sutton has her athletes do regular timed runs. At the last practice, Christine completed a timed run of 1.2 miles in 10 minutes. At the practice before that, she ran 3.2 miles in 25 minutes. What was Christine's average speed over the two runs?

The average speed of Christine is 0.125 miles per hour.

Step-by-step explanation:

At the last practice:

Christine completed a timed run of 1.2 miles in 10 minutes.

The distance covered, D1 = 1.2 miles. The time taken, T1 = 10 minutes.

At the practice before that:

she ran 3.2 miles in 25 minutes.

The distance covered, D2 = 3.2 miles. The time taken, T1 = 25 minutes.

To find the average speed:

"The formula for average speed is total distance divided by total time."

Average speed = (D1 + D2) / (T1 + T2)

⇒ (1.2+3.2) / (10+25)

⇒ 4.4 / 35

⇒ 0.125 miles / hour

∴ The average speed of Christine is 0.125 miles per hour.