A survey of 3,000 who bought a new car showed that 900 people had mechanical issues within the first 2 year.
a. What is the relative frequency of the people that had mechanical issues?

please explain

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?