Joel walks up to a tank of water that can hold up to 20 gallons. When it is active, a drain empties water from the tank at a constant rate. When Joel first sees the tank, it contains 8 gallons of water. Five minutes later, the tank contains 4 gallons of water. Which of the following best represents the rate of discharge

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.