611Electrical EngineeringMediumThe travelling speed of cranes varies from________?A10 to 15 m/sB1 to 2.5 m/sC5 to 10 m/sD20 to 30 m/s Correct answerB. 1 to 2.5 m/s ExplanationThe correct answer is 1 to 2.5 m/s.