Answer
See explanations.
Work Step by Step
Step 1. Identify the key points: $y=0$ means at home, a line slope equals to the speed (distance/time).
Step 2. At time $t=0$, the driver is at home, from 0 to 1 hr, the driver traveled 30 miles at a speed of 30mph.
Step 3. From 1 to 2 hr, the driver drove in the same direction another 20 miles (50-30) at a speed of 20mph.
Step 4. From 2 to 3 hr, the driver drove towards home for 30 miles at a speed of 30mph.
Step 5. From3 to 4 hr, the driver drove away from home for 40 miles at a speed of 40mph.
Step 6. From 4 to 5 hr, the driver drove back home for 60 miles at a speed of 60mph.
