Area and volume question PLEASE HELP!! :) very much appreciated

6.3x+14 and 1.5x-6 answer in simplified form

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?