2 LNDG ACFT ON THE RWY AT THE SAME TIME IN PIT; PA.

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I AM A CHK AIRMAN AND WAS IN THE FO'S SEAT CONDUCTING IOE FOR A CAPT WHO WAS MAKING HIS FIRST LNDG IN THE AIRBUS A319. WE LANDED ON RWY 10L IN PITTSBURGH; PA; ON A VFR NIGHT. OUR SPD WAS TOO FAST AND WE MISSED THE HIGH SPD TURNOFF AT TXWY B3 AND THE TWR WAS NOTIFIED ABOUT THIS. WE CONTINUED DOWN THE RWY EXPEDITIOUSLY TO TURN OFF AT TXWY B2 (THIS WAS TO HELP THE ACFT BEHIND US TO NOT HAVE TO GO AROUND); BUT BECAUSE OF THE LOW EXPERIENCE IN THE ACFT AND THE FACT THAT IT WAS NIGHT; WE COULD NOT COMPLETE THE TURNOFF ONTO TXWY B2 AND HAD TO CONTINUE TO THIS END OF RWY 10L AND TURN OFF AT TXWY B1. THE TWR WAS NOTIFIED OF THIS AND WE THEN MADE THE TURNOFF AT TXWY B1. WE BELIEVE THAT THE ACFT BEHIND US LANDED WHEN WE WERE STILL NOT CLR OF THE RWY. DUE TO THE FACT THAT THE CAPT WAS ON IOE AND THIS WAS HIS FIRST LNDG. THE LOW TIME EXPERIENCE LEVEL COMPOUNDED THE LNDG DISTANCE. ALTHOUGH WE TRIED TO PREVENT THIS FROM HAPPENING; IT WAS PART OF THE LEARNING CURVE THAT CAN HAPPEN. WE FEEL THE ACFT BEHIND US SHOULD HAVE MADE THE ALTERNATIVE CHOICE AND GONE AROUND. SUPPLEMENTAL INFO FROM ACN471976: I MISSED TXWY B3 HIGH SPD TURNOFF DUE TO EXCESSIVE SPD OF 60 KTS. THE ACFT ON FINAL WAS WAITING FOR LNDG CLRNC; SO I MAINTAINED THE SPD TO MAKE THE NEXT TURNOFF TXWY B2. THE COM ON TWR FREQ BY THIS ACFT Y INTIMIDATED ME TO EXPEDITE MY EXIT FROM THE RWY. BECAUSE OF THESE COMMENTS; I TAXIED TOO FAST AND DID NOT MAKE THE TURNOFF DUE TO NO BRAKING EXPERIENCE ON THE AIRBUS. I MADE THE DECISION TO TAXI TO END OF RWY AND EXIT.