Ethan and ava ride their bikes in opposite directions from the same point. ethan rose 2.5 miles every 10 minutes and ave rode 5.5 miles every 30 minutes. how far apart are ethan and ava after 1 hour? after 2.5 hours?

The speed of Ethan is
2.5 miles / 10 minutes = 0.25 miles/minute
The speed of Ava is
5.5 miles / 30 minutes = 0.183 miles/minute

After 1 hour
The distance traveled by Ethan is
0.25 miles/minute x 60 minutes = 15 miles
The distance traveled by Ava is
0.183 miles/minute x 60 minutes = 10.98 miles
Therefore, they are
15 miles + 10.98 miles = 25.98 miles

Do the same for after 2.5 hours (150 minutes)