( 1/5- 1/8)x= 1

(3/40)x= 1

X=40/3 (hours)

Answer: You can fill the pool after 40/3 hours.

2. Solution: Suppose the power was cut off for x minutes.

2 hours = 120 minutes, 1 hour =60 minutes.

( 120-x)/ 120 = 2×(60-x)/60

120-x=2×(60-x)×2

120-x=240-4x

3x= 120

X=40 (minutes)

The power went out for 40 minutes.