Let's do some practice problems.

What is the average speed of a helicopter that flies 50 km in 20 minutes and then 30 km in 10 minutes?

**Step 1: Determine Total Distance**

50 km + 30 km = 80 km

**Step 2: Determine Total Time**

20 minutes + 10 minutes = 30 minutes

Remember, speed is expressed as km/hr or m/s. In this problem, time is measured in minutes, so you must convert to hours.

There are 60 minutes in 1 hour, so the conversion would look like the problem below.

The minutes cancel out, and we are left with 30 over 60 30 60 hours, or 0.5 hours.

**Step 3: Calculate the Average Speed**

Average Speed = 80 km over .5 hr 80 km .5 hr

Average Speed = 160 km/hr

What is the average speed of a lizard that runs 100 meters in 40 seconds and then runs an additional 50 meters in 20 seconds?

**Step 1: Determine Total Distance**

100 m + 50 m = 150 m

**Step 2: Determine Total Time**

40 seconds + 20 seconds = 60 seconds

**Step 3: Calculate the Average Speed**

Average Speed = 150 m over 60 s 150 m 60 s

Average Speed = 2.5 m/s

A snail moves 100 meters in 2 hours. What is his average speed?

**Step 1: Determine Total Distance**

Remember, speed is expressed in km/hr or m/s. To complete this problem, we will need to convert the meters to kilometers or hours to seconds. It is easier to convert meters to kilometers.

100 meters = .1 km

**Step 2: Determine Total Time**

**Step 3: Calculate the Average Speed**

Average Speed = .1 km over 2 hours .1 km 2 hours

Average Speed = .05 km/hr