You discover an old network in a dusty closet at the School of Computing. There are two identical routers connecting two old PCs$.$ You measure the cabling connecting everything together and find that the total length from one computer to the other computer is $20$ meters. You also confirm that the cable is copper$-$based $($meaning data travels at $2$x$108$ m$/$s$).$ You transfer a $20$ kB file between the machines and measure that it takes $90$ seconds to transfer the file $($these are OLD machines!$).$ What is the average throughput of this system? Report your answer in bps rounded to the nearest bit. Show your work.