Airport Extreme - very slow lan

hi!

i've office wi-fi network airport extreme last gen (md031ll) firmware 7.6.1

, lan speed between macbooks not more 20 mbps.

when came home use time capsule 2tb (md032ll) backup speed 95 mbps via wi-fi.

 

do mean mb/s or mb/s (megabit per second)?
if former, presume, how long cables , cables use? , how measure transfer speed?

 

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