how long did john sleep if he fell asleep at 9:40 pm and woke up at 7:00am?

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Answer 1

Vanessa, let's look at a clock.  If it is 9:40 pm, then how long until 10:00?  20 minutes, right?

 

From 10:00 to 12:00 is how long?  From 12:00 to 7:00 is how long?

 

Add all three for your answer.  I bet you can figure it out!