8. Hortencia rides her bike at 10 and 1/2 miles per hour. How far will she travel in 3 and 1/3 hours?

Each hour she rides her bike ten and 1/2 miles, so she will travel 3 and 1/3 ten and 1/2s. Multiply.

When multiplying it is much easier if we change our mixed numbers to improper fractions.

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= 35 miles.

If she rode at 10 mi/hr for 3 hrs, she would have ridden 30 miles. In this problem she rode a little faster for a little longer, so she would have ridden a bit longer than 30 miles, so the answer sounds reasonable.