(2.4x10^2) + (1.5x10^2) a. 3.9x10^2 b. 3.9x10^4

the answer is 390

I would go with A. It is closer to the answer of the equation.

(2.4x10^2) + (1.5x10^2) = 24150

3.9x10^2 = 390

3.9x10^4 = 390000

Step-by-step explanation:

Step 1: Simplify

(66 2/3 miles per hour)

Step 2: Transform hours into minutes by dividing by 60

(1 1/9 miles per minute)

Step 3: Transform miles into feet by multiplying by 5280

or   (feet per minute)