Answer:
1.8minutes
Explanation
From the question, we are told that a copy machine can print 10 pages every 15 seconds, this can be expressed as;
10 pages = 15seconds
To get the amount of time it will take to print 72pages, we will say;
72 pages = x
Divide both expressions
10/72 = 15/x
Cross multiply
10 * x = 15 * 72
10x = 1080
x = 1080/10
x = 108seconds
Convert to minutes
Since 60 seconds = 1minute
108 seconds = y
60y = 108
y = 108/60
y = 1.8minutes
Hence it would take 1.8minutes to print 72 page document
