Verified Answer :

3,125
------------
 125   : 40
-120
-------
   250
  -240
  -------
     100
   -   80
  --------
      200
    - 200
      ------
          0
read a Chapter books in 3 1/8 hours

3hours and 7.5minutes
125/ 40=3r5
60/40=1.5
1.5x5=7.5 mins