Question

Janny went to the library at 3:45pm and left at 7:45 pm. How long was she at the library?

Answer 1

given:

went at 3:45 PM

left at 7:45 PM

to find:

the duration she was at the library.

solution:

( to find the duration just find the difference of the time she left and she went.

= 4 hours

so, she was at the library for 4 hours.