How long are pools for FINA events ?
On July 25 , 2013 FINA Technical Swimming Congress voted to allow world records in the long course mixed 400 free relay and mixed 400 medley relay , as well as in six events in short course meters : the mixed 200 medley and 200 free relays , as well as the men 's and women 's 200 free relays and the men 's and women 's 200 medley relays .