Answer:
Option d.
Step-by-step explanation:
Number of family members = 5
Average time for shower = 8 minute per member
Time period = 30
Initial rate of water = 5-gallon-per-minute
Initial use of water is
New rate of water = 2-gallon-per-minute
Use of water after new shower is
Difference between use of water is
It means the family will use 3600 fewer gallons of water with the new shower heads.
Therefore, the correct option is d.