Một thuyền đi từ bến A đến bến B cách nhau 6 km rồi trở lại về A. Biết rằng vận tốc thuyền trong nước im lặng là 5 km/h, vận tốc nước chảy là 1 km/h. Tính thời gian chuyển động của thuyền.

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the correct sentence which is built from the words and phrases given:

  Then / close / the battery compartment / fit the cover / click / in position.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  exhausted batteries / dispose off / a special container / they / consider / toxic waste.
  
  

• Choose one sentence that has the same meaning as the root one:

  Mary is sure to join us.
  
  

• Choose one sentence that has the same meaning as the root one:

  I'm going to take the money to my bank.
  
  

• Choose one sentence that has the same meaning as the root one:

  We are not going to eat only vegetables this week.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  The visual elements / cinema / need no translation / give / motion picture / universal power of communication
  
  

• Choose the word that has the underlined part pronounced differently from the rest:

  knight                         key                         kick                       goal-keeper

• Choose the word that has the underlined part pronounced differently from the rest:

  government                             against                       globe                        Germany

• Choose the correct sentence which is built from the words and phrases given:

  I / write / give you directions / my house / I also enclose a map
  
  

• Choose the correct sentence which is built from the words and phrases given:

  you / come out of / bus stop, turn right / keep walking / go over a bridge.