Question

A person on a moving sidewalk travels 12 feet in 4 seconds. The moving sidewalk has a length of 90 feet. How long will it take to move from one end to the other

Answer 1

30 seconds

Explanation:

Make a proportion: 12/4 = 90/x

Now solve it:

12/4 = 90/x

(Cross Multiply)

12x = 360

(Divide by 12 on both sides)

x=30