小学奥数题及答案（Primary School Mathematical Olympiad questions and answers）.docVIP

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小学奥数题及答案（Primary School Mathematical Olympiad questions and answers）.doc

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小学奥数题及答案（Primary School Mathematical Olympiad questions and answers）

小学奥数题及答案（Primary School Mathematical Olympiad questions and answers） 70% new housing. Some minor scratches, simulation pad do not affect the game. There is a problem with SNOY 8G memory stick, some key parts of.PSP external camera, two battery charger, data line. For a moped, bending or pedal will do. No big problems can contact the interested parties. Primary School Mathematical Olympiad questions and answers Train crossing bridge problem Fill in the blanks 1., there are two trains, a row of 102 meters long, 20 meters per second line; a row of 120 meters long, 17 meters per second line. Two cars go the same way, from the first train to catch, and the two train to the two car, leaving the need for a few seconds? 2. the speed at which someone walks is 2 meters per second. A train from behind is more than 10 seconds. The known train is 90 meters long. The speed of the train 3. of the existing two train traveling the same direction at the same time in order for 12 seconds, after more than idle. Express express a second line of 18 meters, 10 meters per second for slow. If the two train car tail together simultaneously in the same direction, is more than 9 seconds after the express train train, for two body length. 4. it takes 40 seconds for a train to travel through a 440 meter bridge, and it takes 30 seconds to travel through a 310 meter tunnel at the same speed. What is the speed and length of the car? 5. small and small quick to measure sped by train speed and body length, they took two dollars with a stopwatch. Xiaoying token off the train from her by the time is 15 seconds; Mandy with another piece of the token from the front of the first pole to the rear of the car too take the second poles of the time was 20 seconds. Between two known pole distance is 100 meters. You can help small and small train length and speed sensitivity calculated? 6. it takes 40 seconds for a train to travel through a 530 meter bridge, and it takes 30 seconds to travel through a 380 meter