Alice and Dave left school at the same time walking in opposite directions. Alice walked at an average speed of 280 ft/min and Dave walked at an average speed of 320 ft/min.

600 ft

Step-by-step explanation:

Alice's Average Speed=280 ft/min

Dave's Average Speed=320 ft/min.

Distance = Average Speed X Time

In 1 minute, their distances from their starting point is determined below.

Alice's Distance=280 X 1=280ft

Dave's Distance= 320 X 1=320ft

Since they walk in opposite direction, their distance from each other will be the sum of their distances from the starting point.

Distance of Alice from Dave=280+320=600 ft

In 1 minute, they were 600 ft apart.

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.