How I stopped an alien invasion

An alien crash landed in my back yard and said i had to do a test of 3 questions. And if i dont get all 3 of his questions right he would blow up the earth and turn it into dust.            

Determine the missing value in each equivalent fraction.

Question #1:              Question #2:

      3      18      ?              48 km      114 km       ????

     ---  = ---     ---            ---------  = ----------  =  ------          

      ?      24     12             $16           ??????        $64

    Answer #1:                    Answer #2: 

     3     18    9                     48 km      114 km       92 km

    --- =  ---  ---                   ---------  = ----------  =  --------

    4      24   12                     $16            $48             $64

Question #3 :

a breakfast cereal contains corn, wheat, and rice in the ratio of 3 to 4 to 2. if a box of cereal contains 225 g of corn, how much rice does it contain?

  Answer #3:

150 g of rice