How can I incorporate the equation: change in distance = (change in time)(average velocity) into this question?

Skier A Skier B m = 70 kg m = 50 kg Two skiers start from the same height on opposite sides of a hill. Skier A has a mass of 70 kg while Skier B has a mass of 50 kg. Assume that friction and air resistance are negligible. e. Compare the work done by the normal force on the skiers: Greater for Skier A Same work for both Greater for Skier B Explain