Question

A radio telescope array is in an unpopulated desert region. The array covers a rectangular area that is one fourth square kilometer. The array is one twelfth kilometer wide. How long is the​ array? The array is [blank] kilometers long.

Answer 1

3 km

Explanation:

The area of a rectangle is given by the formula ...

A = LW

Filling in the given information, we can solve for the length.

1/4 = L·(1/12)

Multiplying by 12, we see that ...

3 = L

The array is 3 kilometers long.