How many ways are there to put 4 balls in 3 boxes if the balls are distinguishable but the boxes are not?

See the answer here:

http://web2.0calc.com/questions/how-many-ways-are-there-to-put-4-b-s-in-3-boxes-if-the-b-s-are-distinguishable-but-the-boxes-are-not

Brad can type 1260 words in an hour. What is Brad’s average typing rate in words per minute?