Marcos traveled in his car from Phoenix to Flagstaff on inte

Marcos traveled in his car from Phoenix to Flagstaff on interstate 17, a mountainous highway. He went a total distance of 155 miles in 2 hours 17 minutes without stopping. 160 120 S 80 0.5 1.0 1.5 2.0 Number of hours elapsed since Marcos left Phoenix 2.5 a. Assume Marcos did not travel a constant speed on this drive. Which graph could represent Marcos\' distance traveled in miles as it varied with his time spent driving in hours? b. What was Marcos\' average speed for the entire trip in miles per hour? miles per hour Previevw c. Devon and Marcos rive separately and both leave Phoenix at the same time and arrive in Flagstaff at the same ime. Devon is able to drive at a constant speed. Which graph could represent Devon\'s distance traveled in miles as it varied with his time spent in hours? I Red d. Marcos\' average speed is the Constant ;-speed that Devon traveled , #1n order to cover the ice; -m the same time e. The average speed for the 1st hour of Marcos\' trip was less than ·his average speed for the entire trip. After driving for 2.2 hours (2 hours and 12 mintues), Marcos\' total distance traveled was 153 miles. At what constant speed (in miles per hour) would he have to travel for the last 5 minutes in order to complete the 155 mile drive in 2 hours and 17 minutes? miles per hour Previevw

Solution

Marcos\' graph is the blue one...

Initial point is (0 , 0)
Final point is (2 hr 17 min , 155 miles)

2 hr 17 min = 2 + 17/60 or 137/60 hr

So, now, average speed = (change in distance) / (change in time)

Av speed = (155 - 0) / (137/60 - 0) /

Av speed = 9300/137 miles per hr -----> ANSWER

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F)

Time = 5 min = 5/60 = 1/12 hr
Remaining distance = 2 miles

So,
speed = distance / time

Speed = 2 / (1/12)

Speed = 24 miles per hr -----> ANSWER