It will take you **30 minutes** to drive 40 miles.

Here's the solution using the distance formula:

d = rt

**d = distance, r = rate (or speed) and t = time**

**d = distance, r = rate (or speed) and t = time**

In this word problem, you would substitute in as follows: 40 miles = 80mpht.

40 = 80t

40/80 = t

0.5 = t

t = 0.5 hours or 30 minutes

**Tip!** Learn more about the three basic aspects of movement and travel: distance, rate and time at *Gcflearnfree.org*.