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**Why** I need help translating these two problems into equations correctly.

1. During the first part of a canoe trip, Tim covered 60 km at a certain speed. He then traveled 24 km at a speed that was 4 km/h slower. If the total time for the trip was 8 hours, what was the speed on each part of the trip?

2. The current in a typical Mississippi River shipping route flows at a rate of 4 mph. In order for a barge to travel 24 miles up river and then return in a total of 5 hours, approximately how fast must the barge be able to travel in still water?