Answer:
30 feet
Explanation:
we must find the smallest common multiple and the simplest way to do it is multiple 5 x 3 x 2 = 30 because 15 is not divisible by 2, and the next multiple of 5 and 3 divisible by 2 is 30.
or we can do it the long way:
the multiples of 2 are: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30
the multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30
the multiples of 5 are: 5, 10, 15, 20, 25, 30