Answer:
he waters level dropped inch each hour
Explanation:
- Between 10 P.M. and 7:45 A.M., the water level in a swimming pool
decreased by 13/16 inch
- Assuming that the water level decreased at a constant rate
- We need to find the drop each hour that means the unit rate of
decreased of the level of the water
- At first lets hind how many hours between 10 P.M. and 7:45 A.M.
∵ Between 10 P.M. and mid-night 2 hours
∵ Between mid-night and 7:45 A.M. 7 hours and 45 minutes
- Lets change 7 hours and 45 minutes to hours
∵ 1 hour = 60 minutes
∴ 45 minutes = 45 ÷ 60 = hours
∴ 7 hours and 45 minutes = hours
∴ The total hours between 10 P.M. and 7:45 A.M. = 2 + hours
∴ The total hours between 10 P.M. and 7:45 A.M. =
∵ The unit rate of decreased = The decreased level ÷ total hours
∵ The decreased level is inche
∵ The total hours = hours
- Lets change the mixed number to improper fraction
∵ =
∴ =
∵ The unit rate of decreased = ÷
- To solve the division of 2 fractions change the division sign to
multiplication sign and reciprocal the fraction after the division sign
∴ The unit rate of decreases = ×
∴ The unit rate of decreases = inch per hour
The water level dropped inch each hour