Emily can ride her scooter 18 miles in 50 minutes. At this same rate (speed) how far can she ride in two hours?

First, we need to find Emily's speed in miles per minute.

To do this, we divide the distance she can ride (18 miles) by the time it takes her (50 minutes) to get her speed:
18 miles / 50 minutes = 0.36 miles per minute.

Next, we need to determine how many minutes are in 2 hours.

There are 60 minutes in 1 hour, so there are 60 minutes/hour * 2 hours = 120 minutes in 2 hours.

Now, we can find how far Emily can ride in 2 hours by multiplying her speed (0.36 miles per minute) by the time in minutes (120 minutes):
0.36 miles/minute * 120 minutes = 43.2 miles.

Therefore, Emily can ride her scooter 43.2 miles in two hours at the same rate.