Bernard typically runs x km/hour. While he was sick, he only ran 41.5 km/hour. What equation represents that the difference in his speeds is 13.5 km/hour?

The difference between Bernard’s typical speed, x km/hour, and his speed while sick, 41.5 km/hour, is found by subtracting the slower speed from the faster speed. So the equation is x − 41.5 = 13.5, which is choice A.

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