Julia can finish a 20-mile bike ride in 1.2 hours. Katie can finish the same bike ride in 1.6 hours. To the nearest tenth of a mile, how much faster does Julia ride than Katie? Distance (mi)Rate (mph)Time (hr)Julia20 1.2Katie20 1.6

Find each rider’s rate by dividing distance by time. Julia rides at 20 ÷ 1.2 ≈ 16.7 mph, while Katie rides at 20 ÷ 1.6 = 12.5 mph. The difference is about 16.7 − 12.5 = 4.2 mph, so the correct choice is A, 4.2 mph.

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