It takes 4 minutes for a train to pass a bridge with a length of 2.7 km. It is known that the speed of the train is 0.8 km per minute. How long is the train?

8 × 4-2.7, = 3.2-2.7, = 0.5 (km), = 500 m; answer: the length of the train body is 500 m

A car from a to B, the first third of the road section for the ordinary highway, the rest of the road section for the highway

A car from a to B, the first 1 / 3 of the road for the ordinary highway, the rest of the road for the highway. Known car speed on the ordinary highway is 60 km / h, the speed on the highway is 100 km / h, the car from a to B a total of 2.2 hours

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1. A car from a to B, the front section is the ordinary highway, the rest of the road is the highway. It is known that the distance of the ordinary highway is half the distance of the highway, the speed of the car on the ordinary highway is 60 km / h, the speed on the highway is 100 km / h, the car from a to B has driven for 2.2 hours, how many kilometers is the distance between ab?
2. How many times the speed of a bicycle is that of a car? Write the formula and the answer in fractions
3. A car is 85 kilometers per hour, which is 5 kilometers more than the speed of Li Ming's bicycle. How many kilometers does Li Ming travel per hour?
4. A car travels 358 kilometers in 3.5 hours, and someone rides a bicycle 14 kilometers per hour. How many times is the speed of the car faster than that of the bicycle?
5. The distance between a and B is 360 km. A ship goes back and forth between a and B. It takes 18 hours downstream and 24 hours upstream. The static water velocity is x and the water velocity is y The distance between a and B is 360 km. A ship travels between a and B for 18 hours downstream and 24 hours upstream. Suppose that the speed of the ship in still water is x km / h and the water speed is y km / h, then the equations are formulated and explained carefully
6. 1. Motorcycles travel 40 kilometers per hour. (1) the speed of a bicycle is three fifths slower than that of a motorcycle. How many kilometers per hour does a bicycle travel? (2) The speed of a car is 8 / 5 faster than that of a motorcycle. How many kilometers can a car travel per hour? 2. The original price of a TV set is 1500 yuan, but now it's sold at 1 / 8 of the price. How much is the price of this TV set now?
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9. When the express train reaches one third of the whole journey, the slow train runs for 60 kilometers, and when the express train reaches the second place, the speed of the train will be increased, If the speed of the two cars keeps the same in the process of driving, how many kilometers is the distance between a and B? 60×3＝180 What do you mean 180 △ 90% = 200
10. From place a to place B, it takes four hours for the express train to complete the whole journey, one hour faster than the local train. How much faster is the speed of the express train than the local train?
11. The distance between a and B is 31 km. A goes from a to B by bike. An hour later, B goes from a to B by motorcycle. It is known that a is 12 km / h and B is 28 km / h ① Ask B how many hours after starting to catch up with a; 2. If B returns immediately after arriving at B, how long is the distance between B and a on the way back PS: not much
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13. 126. Master and apprentice work together to process a batch of parts. If they finish the batch in 3 hours, master processes 60 parts per hour, apprentice works alone in 12.5 days. Ask for this batch of parts 1. The master and apprentice work together to process a batch of parts. If they finish this batch of parts in 3 hours, the master processes 60 parts per hour, and the apprentice works alone for 12.5 days. How many parts can I ask for?
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17. A train from place a to place B runs 4 / 7 of the whole journey in 5 hours. At this speed, it takes several hours to complete the whole journey
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20. The car moved at a speed of 90 km / h for 20 minutes and then at a speed of 72 km / h for 10 minutes. Find the average speed of the car in the 30 minutes Can you bring the formula, to be more specific,