Rosie runs 6 miles per hour. She runs for 1 hour on Monday, 30 minutes on Tuesday, 1 hour on Wednesday, and 20 minutes on Thursday. If she wants to run 20 miles for the week, how many minutes should she run on Friday?
On Monday and Wednesday, Rosie runs 6*1= <<6*1=6>>6 miles.
On Tuesday, Rosie runs 6*(30 minutes/60 minutes) = <<6*(30/60)=3>>3 miles.
On Thursday, Rosie runs 6*(20 minutes/60 minutes)=<<6*(20/60)=2>>2 miles.
So far this week Rosie has run 6+3+6+2=<<6+3+6+2=17>>17 miles.
To reach her goal, she must run 20-17=<<20-17=3>>3 miles on Friday.
Thus, she should run for 6/3=.5 hour which is 30 minutes.
#### 30