How can I connect ADSL router and 3G router on network.

I have one ADSL router that I have configured Port Forwarding on it, but the internet is very slow. I also have another 3G router and I want to use it for internet because it is much faster, but it cannot do Port Forwarding. How can I connect this two routers in one network such that ADSL router is for Port Forwarding only and 3G router is for internet only? Please help me out.

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