A plane flies between two cities with a wind speed of 18 km / h. It takes 2 hours and 50 minutes to fly along the wind and 3 hours to fly against the wind, The voyage between the two cities

RELATED INFORMATIONS

• 1. For a batch of goods, a and B can complete 56% of this batch of goods in 6 days. If they are transported alone, it takes the same time for a to complete 13 and B to complete 12______ Day B: Yes______ Day
• 2. Two fifths of the goods were transported in the first time and 78 kg in the second time, accounting for 65% of the total amount. How many kg are there in total? Write the formula
• 3. There are three workshops in a factory. The number of people in the second workshop is 30 less than 4 / 5 of the number in the first workshop There are three workshops in a factory. The number of people in the second workshop is 30 less than 4 / 5 of the number in the first workshop. The number of people in the third workshop is 5 more than 75% of the total number in the first and second workshops. It is known that there are 250 people in the first workshop. How many people are there in the three workshops?
• 4. There are 160 chorus and dance teams in the school, of which the number of dance teams is one third of the number of chorus. How many chorus and dance teams are there?
• 5. A total of 33 teachers and students went to plant trees, a total of 120 trees, 10 trees for each teacher, 4 trees for each boy and 2 trees for each girl How many people did the teacher go to?
• 6. When a, B and C go shopping together, 1 / 2 of a's money is equal to 1 / 3 of B's money; 3 / 4 of B's money is equal to C's money How much did the three spend?
• 7. There are three numbers: A, B and C. A is seven times that of B, and C is 98 times that of B. If a is 112, how many years has C been/
• 8. What is 3 / 4 minus 0.75
• 9. It takes six minutes for a job, five minutes for B, and four minutes for C. now, 1850 parts are to be processed, and three people are required to work at the same time How many parts should each person be assigned to complete the task within a week?
• 10. A / B two warehouse grain ratio is 5 to 1. If we transfer 120 tons of grain into the second warehouse from the warehouse, the ratio of two grain to grain is 7 to 5, and how much food is there in two warehouses? Prawns, help me_
• 11. The two vehicles a and B depart from two places 360 km apart. It is known that the speed of vehicle a is 60 km / h and that of vehicle B is 40 km / h. If vehicle a drives 1 km / H first, the speed of vehicle B is 40 km / h
• 12. There are a and B piles of mud. In the past, the mass of cement in pile a was 7:5 of that in pile B. now, 12 tons of cement is transported from pile B to pile a At this time, the mass of pile a's water hammer is 7.8 moles. How many tons of cement are there in pile a and pile B
• 13. It costs 65 yuan to buy 10 kg apples and 20 kg pears. The price of 1 kg apples is the same as that of 1.25 kg pears I'm stupid,
• 14. The speed ratio of car a and car B is 5 to 4. After meeting, car a and car B go on at the same speed The speed ratio of a and B is 5 to 4. After meeting, car a and car B continued to move forward at the original speed. When car a arrives at B, car B is 60 kilometers away from A. how many kilometers did car B travel when they met?
• 15. After handing over the cargo at a, the two cargo ships of a and B sailed to the East and west respectively. After 1 hour, ship a sailed 10 nautical miles and ship B sailed 8 nautical miles
• 16. There are some coal, a alone transport six days to complete, B alone transport five days to complete, now a transport three times, B transport two times, a total of 18 tons, the original total of how many tons?
• 17. Given a 2 + B 2 + 2a-4b + 5 = 0, find the value of 2A 2 + 4b-3
• 18. Given a-2a + 4B + 4B + 2 = 0, the value of a + B is
• 19. Factorization 3A ^ 3b-12ab ^ 3 + 9A ^ 4B ^ 2-36a ^ 2B ^ 4
• 20. Factorization factor (2a + b) (b-2a) - B (5b-8a)