Final answer:
To find the distance traveled by the tractor trailer truck, convert the given time from minutes to hours and use the formula Distance = Speed x Time. The correct answer is 28 miles.
Step-by-step explanation:
To find the distance traveled by the tractor trailer truck, we need to convert the given time from minutes to hours. Since there are 60 minutes in an hour, 21 minutes is equal to 21/60 = 0.35 hours.
Next, we can use the formula Distance = Speed x Time to calculate the distance. Given that the speed of the truck is 80 miles per hour and the time is 0.35 hours, we can substitute these values into the formula: Distance = 80 x 0.35 = 28 miles.
Therefore, the tractor trailer truck traveling at a speed of 80 miles per hour will go 28 miles in 21 mins. The correct answer is c) 28 miles.