Two conveyor belts each do 12 kJ of useful work moving a batch of parcels. Belt A has a useful power output of 400 W. Belt B has a useful power output of 300 W.
Which statement about the time each belt takes to move its batch is correct?
Belt A takes less time because it transfers more energy each second.
Belt A takes more time because a greater power means it transfers more energy.
Both belts take the same time because they do the same useful work.
Belt B takes less time because it needs a smaller power to do the same work.