Question

Marlon jogs two miles to the park in 25 minutes, turns around, and takes another 55 minutes to walk the same path back to his house. What is his average speed for the round-trip?

Answer 1

3 mph

Explanation:

So the average speed is simply:
`(distance)/(time)`. In case, the total time is 25 minutes + 55 minutes which is a total of 80 minutes, or 1.33 hours. The total distance traveled is two miles + two miles, since he jogged two miles to the park, and then he turns around and walks the same path. So in total he traveled 4 miles. Plugging this in to the formula gives you the equation:
`\overline{v}=\frac{4 \text{ miles}}{(4)/(3)\text {hours}}=\frac{4\text{ miles}}{1}*(3)/(4)\text{ hours} = 3mph`