18 minutes
3/10=18/60
60 represents the hour
18 represents time spent warming up and cooling down.
3x - y = 0 . . . (1)
5x + 2y = 22 . . . (2)
From (1), y = 3x . . . (3)
Putting (3) into (2) gives:
5x + 2(3x) = 22
5x + 6x = 22
11x = 22
x = 2
From (3), y = 3(11) = 33
x = 11, y = 33.
Answer: 85
Step-by-step explanation: 15 × 6= 90 - 5= 85
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