Question

If the power of an engine is known and the amount of time that the engine exerts this power is known, what can be calculated?

the force exerted by the engine
the distance that the engine pushes an object
the mass of the object pushed by the engine
the work done by the engine in the given time

Answer 1

The work is done by the engine in the given time.

Answer 2

The work done by the engine in a given time.
Power is the time rate of change of energy, (which is another name for work, both measured in Joules)
So power = energy/time, with units of Joules/second.
Since you know energy per time, if you know the amount of time you can multiply power by time to get energy (work).