Answer:
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Answer: 1 hour 20 minutes
Step-by-step explanation:
Given : The old machine could shred a truckload of paper in 4 hours.
Rate of work done by old machine = 
The new machine could shred the same truckload in 2 hours.
Rate of work done by new machine = 
Let 't' be the time taken by both of them working together , then we have the following equation:-

Since 1 hour = 60 minutes
Then, 
Hence, it will take 1 hour 20 minutes to shred the same truckload of paper if Ron runs both shredders at the same time.
Answer:
The answers A
Step-by-step explanation:
A has 22, the lowest number, 28, the third lowest number, 42, the middle number, 56, the third highest number, and 61 the highest number!
Answer:
R=(4,5)
Step-by-step explanation:
M={x1+x2/2,y1+y2/2}
(6,7)={8+x2/2,9+y2/2}
Equating the x coordinates and y coordinates
6=8+x2/2
12=8+x2
x2=12-8=4
7=9+y2/2
14=9+y2
y2=14-9=5