Give the step-by-step reasoning process and then the final answer. Keaton climbed a 30 feet ladder twenty times while working at the construction site. Reece, also working at the same site, climbed a ladder 4 feet shorter than Keaton's ladder 15 times. What's the total length of the ladders that both workers climbed in inches?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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If Keaton climbed his ladder twenty times, he covered a length of 30 * 20 = 600 feet. Reece's ladder, 4 feet shorter than Keaton's ladder, was 30 - 4 = 26 feet long. If Reece climbed the ladder 15 times, he covered a length of 15 * 26 = 390 feet. Keaton and Reece's total length covered while climbing the ladders is 390 + 600 = 990 feet. Since one foot is equal to 12 inches, the total length they climbed the ladders in inches is 12 * 990 = 11880 inches.
The final answer: 11880.