Answer:
the water level decreases by 5 feet per hour
Step-by-step explanation:
firstly the bar is going downwards, hence ,making a loss, decrease etc
so 1st and 3rd are out
initially we had 30ft of water
after
1 hr = 25 ft
- 5 ft decreased
2hrs = 20 ft
- 5 ft decreased again from the previous time checked
3hrs = 15 ft
- 5 ft decreased 1 hr ago
hence the water level decreases by 5 feet per hour
