Internet Routing

Routeco wants to route traffic over the internet from San Fransisco to New York. It owns some wires that go between San Francisco, Houston, Chicago and New York. The table below describes how many kilobytes can be routed on each wire in a second. Figure out a set of routes that maximizes the amount of traffic that goes from San Francisco to New York.
Cities Maximum number of kbytes per second
S.F. - Chicago 3
S.F. - Houston 6
Houston - Chicago 2
Chicago - New York 7
Houston - New York 5