Respuesta :

2/3 hour .      1 hour = 60 minutes.

2/3 hour = (2/3) * 60

               = 40 minutes.

20 pages took  (2/3) hour = 40 minutes.

20 pages took her 40 minutes to read.

1 page = 40/20 = 2 minutes.

1 page took her 2 minutes to read.