The travelling speed of cranes varies from
A. 20 to 30 m/s
B. 10 to 15 m/s
C. 5 to 10 m/s
D. 1 to 2.5 m/s
Answer:D
The travelling speed of cranes varies from
A. 20 to 30 m/s B. 10 to 15 m/s C. 5 to 10 m/s D. 1 to 2.5 m/s