Select ALL of the trips that would take 4 hours to complete.
1. Drive 50 miles per hour between two cities which are 200 miles apart.
2. Walk 4 miles per hour to school, which is 8 miles away.
3. Take a train going 90 miles per hour between two cities which are 22.5 miles apart.
4. Bicycle 30 miles at 7.5 miles per hour.
