Một người đi xe đạp với vận tốc 14,4 km/h, trên một đoạn đường song hành với đường sắt. Một đoạn tàu dài 120 m chạy ngược chiều và vượt người đó mất 6 s kể từ lúc tàu gặp người đó. Hỏi vận tốc của tàu là bao nhiêu ?

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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

  I’m not sure whether Julia will be there or not.
  
  

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

  Don’t be so rude to people!
  
  

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

  Don’t bother to lock the door.
  
  

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

  I’m afraid I won’t be able to do the work in time.
  
  

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

  It’s very important to keep your passport in a safe place.
  
  

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

  The police shouldn’t allow people to park there.
  
  

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

  Visitors must leave umbrellas and sticks in the cloakroom.
  
  

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

  He can’t have used a calculator to do it.
  
  

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

  My grandfather’s health is improving.
  
  

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

  Nowadays many people are learning English.