Amazing that they managed to (barely) fly at 140 kt
They weren't flying, the last data point showing 136kt airspeed they had a fraction over 108° left bank and had turned from the take off heading of 267° to 193°, the aircraft then impacted the ground practically flat with little forward speed on a heading of 120°.
So all things being equal two engines out would "need" 80kt to maintain VZRC (give or take)
They would have needed something in excess of 300kt to maintain level flight.