At the rate of 25 per hour, it takes henry 15 minutes to driver from the library to his house. show how to find the distance that henry traveled. include units in your calculation.

I'm assuming it's either Km or Miles per hour. But that's just needed for the final answer unit. Since 15 mins is quarter of an hour and speed is distance/time this gives:
Distance = Speed * time = 25 * 0.25 = 6.25 (put the unit here as miles or Km as the question stated)
Hope that helped.

D