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.
This justifies what answer for what question? Q & A:
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?
11880