question: What speed is a gearless traction elevator capable of attaining ?
answer: 20 m/s ( 4,000 ft/min )
turker_answer: A gearless traction elevator is capable of attaining is 20 m/s ( 4,000 ft/min ) .
rule-based: A gearless traction elevator capable of attaining is 20 m/s ( 4,000 ft/min .