<PRE><B>Question 810901</B>
12a + 4s = 416
a + s = 60
a = 60 - s
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12a + 4s = 416
12(60 - s) + 4s = 416
720 - 12s + 4s = 416
304 = 8s
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s = 38 min
a = 22 min
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