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levanchien
2 năm trước
một tàu tuần tra chạy ngược dòng 60km, sau đó chạy xuôi dòng 48km cùng trên một dòng sông có vận tốc dòng nước là 2km/h . tính vận tốc của tàu tuần tra khi nước yên lặng , biết tổng thời gian xuôi dòng và thời gian ngược dòng là 5 giờ (giúp mình nhé)
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Các câu hỏi liên quan

I. Choose the best answer among A,B,C or D to complete the sentences. 1. He hardly has time to hang out with his friends because his preparation for the show is........... A. expensive B. time-consuming C. timely D. time-saving 2. There are not enough schools or hospitals. Besides, water and electricity supplies may not be........ A. adequate B. plenty C. short D. full 3. If possible, you can take part in other programs such as ........... funds for the poor, helping street children and planting trees and flowers. A. rising B. growing C. arising D. raising 4. He lost his job right after 2 weeks of working simply ........... he didn't work hard enough. A. thanks to B. because C. while D. when 5. I'd like to buy the shoes .............. the ones on display at the exhibition. A. like B. similar C. are like D. as II. Put the verbs in the brackets into the corect tense of form. 1. Compost (make) ............. from vegetable matter (consider) .......... a wonderful natural fertilizer. 2. Why you (wear) ........... than thin dress? You (freeze) ........... to death in this cold weather, I think. 3. I'm pleased you want to know more. "Reduce" means (not buy) ............ products which are overpackaged. 4. Why you always (talk) ........... in the class? I can't stand it. III. Fill in the blanks with the correct form of the words in capital lettters. 1. Freedom of .............. is one of the fundamental rights. (SPEAK) 2. Don't be so .......... We've only been waiting for a few minutes. (PATIENT) 3. The weather was terrible, so we had a very ............. holiday. (PLEASE) 4. He gave no ................ for his absence. (EXPLAIN) 5. Please ................ your seat belt. The plane is taking off. (FAST) 6. She received a lot of ............ from her mother. (ENCOURAGE) 7. I can think of .................. reasons for not attending the meeting. (COUNT) IV. Each of the following sentences contains one error. Find and correct it. 1. Tom and Thomas were bad injured in the last match, so neither of them can play the match today. 2. I really like reading books writing in English. 3. She objects to be laughed at her mistakes. 4. Please contact me with the above address for more information. 5. Could you make me a favor and lend me your bike? 6. They are planting trees by the roadside so that reduce the pollution. 7. The government wants everyone to recycle 25% of their household wasting.

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