ExplanationCarlos’s lap times can be expressed as x, x + 5, and x – 2. (Remember, slower race times are greater numbers, so “five seconds slower” means plus 5, not minus 5!) Average the lap times:

\(\frac{x+(x+5)+(x-2)}{3}=\frac{3x+3}{3}=x+1\)

His average time is x + 1 seconds. But the question requires minutes. Since there are 60 seconds in a minute, divide by 60 to get \(\frac{x+1}{60}\), or choice (D).

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Sandy

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