Networking help?

I have two pc's on a network,
PC1
IP 192.168.0.2
Default Gateway - 192.168.1.1

Router (connected to a WAN)
IP - 172.16.50.1

PC2
IP- 2.168.20.2
Default Gateway - 192.168.20.1

how can I get them all to communicate, what would I use as the ip address on the router
6 answers 6