Acarton measures 3 feet by 2 feet by 2 feet. a machine can fill the carton with packaging material in 3 seconds. how long would it take to fill a carton that measures 4 feet by 5 feet by 6 feet?

 3 × 2 × 2 = 12 feet cubed ( the volume of the carton) 
   4 × 5 × 6 = 120 feet cubed (the volume of the carton) 
if it takes 3 seconds to fill a carton with a volume of 12 then how long will it take to fill a carton with a volume of 120?
12÷3= 4 
therefore 4 feet cubed is the amount of space that the carton will be filled with per second. 
120 ÷ 4 = 30 
therefore it takes 30 seconds to fill a carton that measures 4 feet by 5 feet by 6 feet.