# Bob roller skates 48 km in 4 hours. What is his average speed in kilometers per hour?

##### 1 Answer

His average speed is

#### Explanation:

Remember the triangle of Speed, Distance and Time. If you remember it, you'll ace these kinda questions.

I had trouble with these formulas but the triangle helped me a LOT! Anyways, let's get back to the question. The formula for *average* speed is pretty much the same as the formula for *just* speed. The average speed formula is

So......

My source

I hope this explanation helps you!