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It takes 55 seconds for a train to cross the 890 meter bridge It takes 45 seconds to cross the 690 meter tunnel at the same speed. How long is the train?
(890+x)/55=(690+x)/45
The solution is x = 210
A railway bridge is 1200 meters long. It takes 75 seconds for a train to cross the bridge. It takes 15 seconds for a train to cross the first signal pole beside the road. Find out the speed and length of the train! The problem of the train crossing the bridge,
75 seconds is 1200 meters long for the train to cross the bridge and get on the train
15 seconds is a long time for a train to pass by itself
When a train runs over 1200 meters, it takes 75-15 = 60 seconds, the speed of the train is 1200 / 60 = 20 meters / second, and the length of the train is 20 * 15 = 300 meters
Check, (1200 + 300) / 20 = 1500 / 20 = 75 seconds, answer: speed 20 meters / second, car length 300 meters!
Xiaoming is standing by the railway. The train passes him. It takes two minutes for the train to be 900 meters long and pass a bridge at the same speed. How long is the bridge in five minutes?
If you want to use arithmetic, please make the meaning of each step clear!
Train speed: 900 / 2 = 450 m / min
Distance traveled by train in 5 minutes: 450 * 5 = 2250m
Length of bridge: 2250-900 = 1350m
RELATED INFORMATIONS
- 1. The total length of a railway bridge is 1200 meters, and it takes 75 seconds for a train to cross the bridge; it takes only 15 seconds for a train to cross the roadside poles, so the total length of the train is 1200 meters______ Rice
- 2. The school library has purchased three kinds of books, among which the number of story books accounts for 1 / 3 of the total number, 150 comic books, and the ratio of the number of science and technology books to the total number of the other two books is 1:5. How many of the three kinds of books have been purchased?
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- 5. Xishan primary school is going to build a multi-functional classroom. It needs 1600 pieces of wood floor with a length of 50 cm, a width of 10 cm and a thickness of 3 cm to lay the floor. How large is the area of this multi-functional classroom? How many cubic meters of wood should be used to lay the floor? Pour 12 cubic decimeters of water into a 3-decimeter-long, 2-decimeter-wide and 4-decimeter-high rectangular glass tank. How many decimeters is the distance between the water surface and the tank mouth?
- 6. Asking for help: two practical problems in sixth grade mathematics of primary school The first topic is: There are 18 spiders, dragonflies and cicadas, with 118 legs and 20 pairs of wings. It is known that spiders have 8 legs, dragonflies have 6 legs and 2 pairs of wings, and cicadas have 6 legs and 1 pair of wings?
- 7. Use a simple method to calculate the scores of the following questions Two nines minus seven sixteen times two nines Two fifths by four times three fourths One half by one-fifth plus one-third by one-half Four fifths by seven ninths by five eighties Five sixths by five nines plus five nines by one sixth Five out of seven by sixteen by twenty-one out of five
- 8. Several primary school mathematics application problems, help to solve 1. The length of a wall clock's hand is 20 cm. How many cm does the tip of the hand walk in a day and night? 2. The diameter of a round flower bed is 3 meters. A circle of railings is set 0.8 meters away from the flower bed. How many meters is the total length of the railings? 3. The circumference of a piece of square paper is 20 decimeters. Cut it into the largest circle. How many decimeters is the circumference of this circle? 4. The express train from a to B runs in 8 hours, and the local train from B to a runs in 12 hours. The two trains run from a and B at the same time. On the way, the two trains meet and continue to move forward. After 6 hours, the distance between the two trains is 90 kilometers. How many meters is the distance between a and B? Want arithmetic solution, don't equation solution, also want to explain, trouble, online, etc., will add reward, hurry up
- 9. When an aircraft flies between the two cities, the wind speed is 24 km / h, it takes 2 hours and 50 minutes to fly against the wind, and it takes 3 hours to fly against the wind to calculate the speed of the aircraft when there is no wind
- 10. We need to solve the linear equation with one variable For a three digit number, a hundred digit number is 4 times smaller than a single digit number, and a ten digit number is 1 times larger than the sum of a single digit number and a hundred digit number. The value of the three digit number is just 25 times that of the ten digit number
- 11. It takes 40 seconds for a train to cross the 530 meter cave and 30 seconds for a train to cross the 380 meter bridge at the same speed What's the speed of this train? How long is its body?
- 12. A train passes a 900 meter long railway bridge. It takes 1 minute and 25 seconds from the front of the train to the rear of the train to leave the bridge. Then the train goes through a 1800 meter long tunnel. It takes 2 minutes and 40 seconds from the front of the train to the rear of the train to leave the tunnel
- 13. A 210 meter long train passes a 900 meter long bridge at a speed of 30 meters per second. How long does it take for the train to pass the bridge completely?
- 14. A bridge is 500 meters long. It takes one minute for a train to get on the bridge from the front to the rear. The time for the whole train to be completely on the bridge is 50 seconds Length?
- 15. A bridge is 1000 meters long, a train is 80 meters long, and the speed is 50 m / s In a hurry Solving linear equation with one variable
- 16. A train is 700 meters long, passing through a bridge at the speed of 400 meters per minute. It takes 5 minutes from the front of the train to the rear of the train. How long is the bridge?
- 17. A 700 meter long train passes a 900 meter long bridge at a speed of 400 meters per minute______ Minutes
- 18. A 120 meter long train passes the 880 meter long bridge at a speed of 50 km / h. how many seconds does it take for the train to get on and leave the bridge?
- 19. Nanjing Yangtze River Bridge and Wuhan Yangtze River Bridge, which is the first bridge in China
- 20. It takes 25 seconds for a train to pass through a 250 meter long tunnel and 23 seconds to pass through a 210 meter long tunnel. If the train meets another 150 meter long train with a speed of 72 km / h, it will be necessary for the train to miss______ second?