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1. It takes 24 minutes, to clean 1 room.

   Given that,
   Todd keeps his 4 room house very clean.  
   It takes him 1 hour and 36 minutes to clean his whole house.
   How long it takes him to clean 1 room is to be determined.

   What is arithmetic?

   In mathematics, it deals with numbers of operations according to the statements.

   In the given question we have given a relationship between time and work, This question has a proportional approach.

   Here,
   4 room = 1 hour 36 minutes
   4 room =  60 + 36
   4 room = 96 minutes
   1 room = 24 minutes

   Thus, it took 24 minutes for Todd to clean 1 room

   Learn more about arithmetic here:

   brainly.com/question/14753192

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