The speeds depend on the hub to which your DC++ client connects. If your friend is connecting to a local hub then the speeds are dependent on the actual LAN speeds, while if you connect to a hub from the internet then the speeds will be capped by your ISP. On good local hubs it is easy to get speeds of 10MBps+.
Most of the DC++ hubs are usually from the ISPs which use a cable to your building for providing connectivity. MTNL Triband does not allow this and I am not sure whether reliance wimax does. Check on "broadband forums india" for your specific area/ISP wise details.