Kristina travels 25 miles to work. In the mornings, it takes her 38 minutes to get to work, but in the evenings, it only takes her 32 minutes to get home. What is Kristina\u2019s average speed for the entire journey to work and back home?

A 42.9 mph

explanation

Kristina\u2019s average speed is 42.9 mph. The formula to find speed is distance over\u00A0time.
Total time = 32 min + 38 mín =70 min = 7/6 h.
Average speed = [(25 miles*2)/(7/6) = 42.9 mph.