total length will be 330+66=396
time=6 secs

speed=396/6=66feet/sec

conversion to miles per hour=66*3600/5280=45.

Answer C.

Regards!

AAPL wrote:The rear-most end of a 66-foot truck exits a 330-foot tunnel exactly 6 seconds after the front-most ends of the truck entered the tunnel. If the truck traveled the entire tunnel at a uniform speed, what is the speed of the truck in miles per hour (1 mile = 5,280 feet)?

A. 225
B. 90
C. 45
D. 37.5
E. 27

Let's find the distance traveled by the front-most end of the truck. After traveling the 330- foot tunnel, the front-most end travels an extra 66 feet before the rear-most end exits the tunnel. Thus, the truck travels 330 + 66 = 396 feet in 6 seconds.

Let's now convert 396 feet to miles and 6 seconds to hours.

396 feet = 396/5280 miles

6 seconds = 6/3600 = 1/600 hours.

Thus, the speed of the truck is (396/5280)/(1/600) = (396 x 600)/5280 = 45 miles per hour.

Answer: C