Question

The marker posts on a highway are 0.1 miles apart. If a truck is timed taking 5

seconds between posts, how fast is the truck going (in MPH; there are 3600 seconds
in an hour)?

Answer 1

v= 72 miles/hour

Step-by-step explanation:

Speed

The speed is the ratio of the distance x traveled by an object and the time t it took to complete the distance.

We calculate the speed as follows:

`\displaystyle v=(x)/(t)`

The truck was timed taking t=5 seconds between posts that are x=0.1 miles apart.

The speed of the truck is:

`\displaystyle v=(0.1)/(5)`

`v=0.02\ miles/sec`

Since 1 hour = 3,600 seconds:

v=0.02 * 3,600 miles/hour

v= 72 miles/hour