A car pulls onto the USS Nimitz, which is now a car ferry. As a car enters

Question:

A car pulls onto the USS Nimitz, which is now a car ferry.

As a car enters the ferry, there are four rows of traffic directors arranged in a triangular pattern, such that one director is in the first row, two in the second, three in the third, and four in the fourth row. They are directing traffic into five parking spots, labeled A through E in Figure 1.7.

Figure 1.7

A B C D one way E