Quãng đường AB là một đoạn đường dốc. Một người đi xe máy từ A đến B lên dốc hết $\frac{3}{4}$ giờ, lúc về đi từ B đến A hết 35 phút. Tính vận tốc xe máy lúc về, biết tổng vận tốc của xe máy lúc đi và vận tốc xe máy lúc về là 80 km/giờ.

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Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  _______ anyone object, the plan will be reconsidered.         

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  I'm really sleepy today. I wish I _______ Bob to the airport late last night.         

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following question:

  Not only………………the exam but she also got a scholarship.  

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  The number of learners of English _______ in recent years.         

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  He said if he had not answered the phone at the petroleum station then, he _______ a fine.         

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  I _______ to Greece until Sally and I went there last summer.         

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  When you have a small child in the house, you _______ leave small objects lying around. Such objects _______ be swallowed, causing serious injury or even death.         

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  I_________this letter around for days without looking at it.  

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  By the end of the 21st century, scientists__________a cure for the common cold.      

• Mark  the  letter A, B, C or D on  your answer  sheet  to  indicate  the  correct  answer  to  each  of the following questions:     

  He managed to win the race__________hurting his foot before the race.