Task: Question Answering
Input (English): Problem: an assembly line produces 90 cogs per hour until an initial order of 60 cogs is completed . the speed of the assembly line is then immediately decreased so that it only produces 60 cogs per hour until another 60 cogs are produced . what is the overall average output , in cogs per hour , for the assembly line during this whole time ? 
Options: a ) 68 , b ) 69 , c ) 70 , d ) 71 , e ) 72
Output (English): e