3. Sasha is riding a scooter, and Galia is riding a gyroscooter. On an uphill, Sasha rides the scooter at a speed of 8 km/h, and downhill at a speed of 24 km/h. Galia rides the gyroscooter uphill at a speed of 16 km/h, and downhill at a speed of 18 km/h. Sasha and Galia are competing on a circular track, a quarter of which is an ascent, and the rest is a descent. They start moving uphill at the beginning of the ascent simultaneously. Who will be the first to overtake the other, and on which lap will this happen?
Answer: On her $11-\mathrm{th}$ lap, Galya will overtake Sasha on his $10-\mathrm{th}$ lap.