Please answer the following question by reasoning step-by-step.
Lionel walked 4 miles. Esther walked 975 yards and Niklaus walked 1287 feet. How many combined feet did the friends walk?

25332
Lionel = 4 * 5280 = 21120 feet.

Esther = 975 * 3 = 2925 feet.

Together = 21120 + 2925 + 1287 = 25332 feet.

Together the friends walked 25332 feet.

.

The answer: 25332