Exercise 1: it is known that in absence of friction, distance traveled D (measured in miles) is a function of time Spent traveling i: (measured in hours) when travelling at a constant rate. A particular semitruck driver has traveled 120 miles in 2 hours at a constant rate. They continue traveling at a constant rate and travel 300 miles in 5 hours. a. What is the semi-truck driver's rate of change in distance with respect to time? b. IWrite the equation that models distance traveled D as a function of time spent traveling t. c. How far has the driver traveled in 3 hours? d' How long does it take for the driver to travel 400 miles? e. ls distance traveled proportional to time spent traveling? Explain using mathematics