1 hour 23 min

1. Rain umbrella theory
2 hour 5 min

2. Rain umbrella problems
2 hour 5 min

3. River Boat Theory
2 hour 5 min

4. River Boat problems part-a
2 hour 5 min

5. River Boat problems, part-b
2 hour 5 min

6. River Boat Problems part-C
2 hour 5 min

7. Aircraft wind &miscellaneous
1 hour 23 min