Red Riding Hood drives the 432 miles to Grandmother’s house in 1 hour less than it takes the Wolf to drive the same route. Her average speed is 6 mph faster than the Wolf’s average speed. How fast does Red Riding Hood drive?

Let the Wolf’s speed be v mph, so Red Riding Hood’s speed is v + 6 mph. Their travel times differ by 1 hour, so 432/v − 432/(v + 6) = 1. Solving gives v = 48, making Red Riding Hood’s speed 48 + 6 = 54 mph. The correct choice is b, 54 mph.

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