Airtel Wi-Fi speeds and some other questions

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Location
NA
ISP
Jio GigaFiber
I am using an airtel connection in Dwarka, Delhi. Initially, i had a Binatone 920W router which on LAN gave speeds of up to 40 Mbps and on wi-fi, it was ~30-35 Mbps.
Recently, the airtel guys changed my router to Beetel 777Vr1. Although, this router gives approx. 40 Mbps speeds on LAN, the wi-fi speed is drastically reduced to ~5-7(or 8)Mbps. What are the normal speeds for wi-fi on airtel broadband? (Just give a general idea of what you are getting, in Delhi region) Like I said previously I used to get 30-35 Mbps on wi-fi, so yeah which one is the outlier, the slower speed or the faster one?

Also, the 2 routers i mentioned are they actually routers or modem-cum-router. As of now, to me, it seems these are only routers and not modems but then how am I able to use the internet. Do these airtel guys connect the routers to a central modem or something?
 
They are Modem cum routers
Best option is to get a new high gain (5db) WiFi router like the mi3c and connect that and disable WiFi completely on the modem .....
 
yes it is ,but op has only 40mbps max speed so no point in buying 5ghz router .....mi3c has very good wifi range and speed i used to get 53mbps on my 60mbps connection over wifi in the next room
 

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