High School

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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 :

Answer:

v= 72 miles/hour

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:

[tex]\displaystyle v=\frac{x}{t}[/tex]

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

The speed of the truck is:

[tex]\displaystyle v=\frac{0.1}{5}[/tex]

[tex]v=0.02\ miles/sec[/tex]

Since 1 hour = 3,600 seconds:

v=0.02 * 3,600 miles/hour

v= 72 miles/hour

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