They don't communicate to each other. Because both are in a different network which signified by its IP address, to connect two different networks we need a router. If a router is placed between them, rather than they don't communicate coz of  default gateway address given to end devices are differ than its ip address, which belongs to another network.

They don't communicate to each other. Because both are in a different network which signified by its IP address, to connect two different networks we need a router. If a router is placed between them, rather than they don't communicate coz of  default gateway address given to end devices are differ than its ip address, which belongs to another network.