1. ron started to cook for breakfast at 7:45 a.m. and he finished at 8:05 a.m. how long did he spend for cooking?

2. bet started to plant in the back yard at 6:05 a.m. and he finished at 6:55 how long did he spend for planting?

3. the volleyball game starts at 9:40 a.m. the ends at 12:20 p.m. how long did it last?