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A traveler at an airport takes an escalator up one floor. The moving staircase would itself carry him upward with vertical velocity component 0.8 m/s between entry and exit points separated by height 10.0 meters. However, while the escalator is moving, the hurried traveler climbs the steps of the escalator at a rate of 2.8 steps per second. Assume that the height of each step is 0.3 meters.

a) Determine the amount of work done by the traveler during his escalator ride, given that his mass is 80.0 kg

b) Determine the work the escalator motor does on this person.

For a, I summed the man's and the escalator's velocities and used the W = Fd equation. I'm not sure how to go about b.

I was wrong for a, so I'm really up a creek on this one. Any help is greatly appreciated.