Depends on the coeficient of friction,hard to check while enroute. Query ATC as to aircraft landing ,how long ago-where did they stop on the runway??,or did they use it all??.At one time Carriers were 'shy'to stipulate any x/wind limit,apart from the "limitation's" section of the AFM!!Now adays the general limit for a poor braking report is 5knots on the beam,keeping in mind that any report less than fair(about .3 JBI/MU)means that your going to use more runway than Certification(have you enough??)allows.Operations shouldn't be planned on any fair to poor runway.If they happen to 'end up'so-divert.