if someone watches doctor who for 4 hours per day and each episode is 45 minutes long, how many episode will they have watched by the fifth day?

If they do, they are not spending their time wisely!

 

4 hours per day X 5 days =20 hours watched in 5 days.

1 hour =60 minutes

20 hours X 60 minutes=1,200 minutes

1,200 minutes / 45 minutes per episode =26 2/3 episodes they will have watched in 5 days.