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       五年级奥数题及答案
让孩子可以在空余时间做做题目，开拓思维，下面是五年级奥数题及答案，希望对大家helpful.
Grade Five
1. A circular runway has a circumference of 300 meters. A and B start from both ends of the diameter at the same time. To catch up with B, ask for the speed of A and B?
2. A and B start from two places at the same time and walk towards each other, the distance is 100 kilometers. A travels 6 kilometers per hour, B travels 4 kilometers per hour, A takes a dog, and the dog travels 10 kilometers per hour. The dog started with A, and when it met B, it turned around and ran towards A, and when it met A, it turned around and ran towards B again. How many kilometers did the dog run until the two met?
Fifth Grade Answers
1. The speed sum of A and B: 300÷2÷1=150m/min, in the same direction, if A is faster, A has to run half a lap longer than B to catch up with B. Therefore, the speed difference between A and B: 300÷2÷5=30m/min
So A’s speed: (150+30)÷2=90m/min
B’s speed: (150- 30) ÷2=60 m/min
Answer: A's speed is 90 m/min B's speed is 60 m/min
2.100÷(6+4)=10 hours
10×10= 100 kilometers
Answer: The dog ran a total of 100 kilometers.