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?

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• 1. 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
• 2. 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?
• 3. 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?
• 4. 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
• 5. 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?
• 6. Don't use equations to solve every problem~ one (1) The original price of water for residents in a city is 1.5 yuan per cubic meter, which has been increased by 20%. How much is the price per cubic meter after the price increase? (2) After a 20% increase in the price of water for residents in a city, the price per cubic meter is 1.8 yuan. What is the price per cubic meter before the price increase? 2. At the time of the fifth census, the population of the mainland of China was about 1.27 billion, of which the Han nationality accounted for 91.6%. How many billion ethnic minorities are there in the mainland of China? 3. Brass is an alloy of copper and zinc, in which the content of copper is 68%. A piece of brass contains 16 kg of zinc. How many kg does this brass weigh?
• 7. Deposit 200 yuan in the bank for one year. If the annual interest rate is 2.25%, how many yuan can be withdrawn when it matures? (tax deduction) Deposit 800 yuan in the bank for 2 years with an annual interest rate of 2.43%. How much interest tax should be paid when it matures? How much of the principal and after tax interest can be withdrawn when it matures?
• 8. 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?
• 9. 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?
• 10. 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
• 11. 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?
• 12. 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
• 13. 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?
• 14. A 700 meter long train passes a 900 meter long bridge at a speed of 400 meters per minute______ Minutes
• 15. 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?
• 16. Nanjing Yangtze River Bridge and Wuhan Yangtze River Bridge, which is the first bridge in China
• 17. 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?
• 18. It takes 25 seconds for a train to pass a 250 meter long tunnel and 23 seconds to pass a 210 meter long railway bridge (1) (2) if the train is 150 meters longer than another train with a speed of 72 kilometers per hour, how many seconds will it take for the two trains to pass by when they meet?
• 19. 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. Q: does it take the train to miss another 320 meter long train with a speed of 64.8 kilometers per hour___ Seconds
• 20. It takes 45 seconds for a bus to cross the 8640 meter long bridge and 35 seconds for it to cross the 610 meter long tunnel at the same speed