1 day = 24 hours，$$1$$ hour = 60 minutes，$$1$$ minute = 60 seconds，$$24$$ days = (24 \times 24) hours = [(24\times 24) \times 60] minutes = 24\times 24\times 60\times 60 seconds 
Which of the following calculations shows how to work out the number of seconds in~~24 days? 

  - 24 x~24~ 
  - 24 x~60 
  - 24 x 24 x 60 
  - 24 x 60 x 60 
  - 24 x~24 x~60 x~60 