Answer:
Step-by-step explanation:
Given that: the height of the building is 862 ft
Time taken : 30 seconds
Solve: 1 foot = 0.3048 meters
862 feet = 262.7376 m
now, the speed of elevators = distance/time
= 262.7376/30
= 8.75792
= 8.76 m/s (Approximately)