3km:500m in lowest terms

6.1

Step-by-step explanation:

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To do this we must rearrange the original pythagorean theorem formula...

Now, we need to input the given numbers into our new formula...

Alright, now that we have done that lets find out what 5² and 4² equals...

Now that we have done that we need to subtract 16 from 25...

We need to find the square root of our answer (9) to get our final answer.

The square root of 9 equals 3. Thus, our final answer is B, x=3.