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Math Olympiad 79 Question 1 4 minutes A freight train travels 1 mile in 1 minute 30 seconds. At this rate, how many miles will the train travel in 1 hour? Answer:40 miles Question 2 5 minutes A person has four special coins whose values in cents are shown below. How many different amounts can the person make using one or more of the coins? 3 1 5 10 Answer:15 Question 3 5 minutes If I add 5 to 1/3 of a number, the result is ½ of the number. What is the number? Answer: 30 Question 4 6 minutes The length of AE is 20 cm. B is the midpoint of AC, C is the midpoint of BD, and D is the midpoint of BE. What is the length of DE in cm? A B C D E 20 Answer: 8 cm Question 5 6 minutes What simple fraction is equal to the complex fraction shown below? 1 4 1 1 2 3 Answer: 7 31