Machine A and Machine B are each used to manufacture 660 sprockets. It takes machine A 10 hours longer to produce 660 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine A. How many sprockets per hour does machine A produce?
this is how i did..
t=660/1.1ra you can right 1.1 as 110/100; 660*100/110*ra =600/ra
ra=60/10 ra=6 sockets per hour