Please explain the steps super clearly. I care more about how to get there then about the answer.

1. Maud can paint a certain room in about 5 hours, and Alicia can paint the same room in about 4 hours. Approximately how many hours would it take Maud and Alicia to paint that room if they work together?

2. Mario paddle his canoe upstream for 3 hours. When he turned around and paddled back to his starting point, it took him only 1 hour. If the river flows at a speed of 3 mph, how fast could Mario paddle his canoe in still water?

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