Trivia Week: How Many Tiles in the Tunnel?

Here’s today’s question:   How many tiles cover the walls of the Tunnel? 

Here’s my answer:  69,660

I know that Tunnel is 5160 feet in length or 61,920 inches.  If the tiles are 16 inches long, that means there are 3870 tiles for one row.  There are 9 tiles high and 2 walls.  So (61920 / 16) * 9 * 2 = 69,660. 

Anyone else care to venture a guess?

It requires a lot time in the Tunnel to think about this.

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