A B742 CREW LANDED AT SEQU WHILE DEPARTING ACFT WAS STILL ON THE RWY.

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QUITO TWR CLRED ACFT Y; AN F28; INTO POS FOR TKOF IN SPANISH. OUR CREW WAS UNAWARE OF THIS AS WE WERE ON FINAL SEGMENT OF ILS APCH. FOG WAS OBSCURING THE RWY FROM OUR VANTAGE POINT AND WE WERE TOLD TO RPT THE MIDDLE MARKER. AT THE MIDDLE MARKER; WE SAW THE ACFT (F28) APPROX 2000 FT DOWN THE RWY ACCELERATING PAST 80 KTS. AT APPROX 100 FT ATC GAVE US LNDG CLRNC WHILE THE F28 WAS STILL ROLLING. WE ADVISED TO THE TWR WE WERE UNABLE TO EXECUTE A GAR SAFELY DUE TO TERRAIN RESTRS; AND THE SID/MISSED APCH PROC BEING IDENTICAL. THE CREW ELECTED TO CONTINUE THE LNDG WHILE THE F28 WAS STILL ON THE RWY. WE FELT THAT OUR LIGHT LNDG WT (198000 KILOGRAMS) WE WOULD HAVE BEEN IN A SAFER SIT WITH 2000-3000 FT SEPARATION ON THE RWY; IN THE UNLIKELY EVENT OF AN ABORT BY THE F28. A NORMAL LNDG RESULTED WITH NO FURTHER EVENTS. F28 CONTINUED TKOF WITHOUT INCIDENT. UPON CONFERENCE WITH CTL TWR; F28 WAS CLRED FOR TKOF WHILE WE CALLED THE OM. ACFT Y APPARENTLY DELAYED TKOF WITH NO ATC COM. LANGUAGE MAY HAVE BEEN FACTOR. COMS SHOULD HAVE BEEN IN ENGLISH. SUPPLEMENTAL INFO FROM ACN 530703: POSSIBLE SOLUTIONS; THAT ALL COM SHOULD HAVE BEEN IN ENGLISH. WE COULD HAVE BEEN GIVEN A GAR SOONER; WITH ACFT Y BEING TOLD TO ABORT TKOF. THE F28 SHOULD NOT HAVE DELAYED THEIR TKOF ROLL; BUT ONCE THEY DID THEY SHOULD HAVE HAD TKOF CLRNC CANCELED.