Find the efficiency of this machine?

Question

A chain hoist furnished with 120 hp lifts to a height of 40 ft in 20 sec.

Answer 1

Not enough data. What weight are you lifting ?

Answer 2

let´s get coherent units1 hp=0.7453 kw
and 40 feet = 12.192m
The power used = weight lifted*velocity
As you don´t state the weight there is information missing
in any efficiency = weight*velocity /120*745.3
Units
weight Newtons,Power watt ,height meter and time sec.