1 . Tim plans to spend 180 minutes reading English books to improve his reading every week. According to the table, it takes him ________ hour (s) to do it on weekdays.

Tim’s Reading Plan
Mon.	Tue.	Wed.	Thur.
20 minutes	15 minutes	20 minutes	25 minutes
Fri.	Sat.	Sun.
?	20 minutes	40 minutes

A．1

B．2

C．40