A student estimates that his daily commute to college consists of 10 minutes driving at a speed of 20 mph to a divided highway, followed by 5 minutes in which he accelerates to 60 miles per hour, and 15 minutes driving at 60 mph before slowing to exit and enter the parking lot. The figure shows his velocity in terms of time. v(t) miles per hour 70 50 30 10 1 hours 0.1 0.2 0.3 0.4 0.5 .apn .......................... 1 6 (a) What are the units of measure of height, width, and area of the region between the speed graph and the horizontal axis? height miles per hour v y width hours v V area miles v y (b) How far does the student drive on his commute from home before exiting to the parking lot? (Round your answer to one decimal place.) mi u