AD=9 units. AB=3 units. thus: 9/3=3
Answer:

Step-by-step explanation:
Given
See attachment for playground
Required
Determine the area
The playground is a trapezoid. So;

From the attachment, the parallel sides are: 68ft and 36ft
The height is: 30ft
So, the area is:




Answer:
10 minutes
Step-by-step explanation:
Let's use the variable x for the amount of coins.
The first machine can sort x coins in 15 minutes, so its speed is x/15 coins/minute.
The second machine can sort x coins in 30 minutes, so its speed is x/30 coins/minute.
If we sum the speeds, we have that the speed will be:
speed = (x/15) + (x/30) = (2x + x)/30 = 3x/30 = x/10
The total speed can sort x/10 coins per minute, that is x coins in 10 minutes.