<span>We can solve this problem by assigning x as the number of steps were the escalator is standing still. Going up 60 steps means that we must add 60 to x and going down means that we would have to subtract it by x. Since both ways are the same then,

60 + x = 90 - x

x = 15

Therefore, se would have taken 15 steps to either direction.</span>

**Answer:**

8 miles per hour.

**Step-by-step explanation:**

24miles in 4 hours = 24/4=6 miles per hour.

24 miles in 3 hours = 24/3=8 miles per hour. The boat going with the current of the river is traveling at 8 miles per hour.

Answer: 18w^2 - 6w + 4

Explanation:

(4 + 7w^2) - (6w - 11w^2)

= 4 + 7w^2 - 6w + 11w^2

= 18w^2 - 6w + 4