In a mixture of hydrogen and helium gases, the mole fraction of helium is 0.75. If the partial pressure of hydrogen in the mixture is 75 torr, what is the total pressure of the mixture

Mathematically, work = force x distance at coaster world, the tallest rollercoaster is the pinnacle. the top of the first hill is 40 meters high. it takes 160 newtons of force to bring a car to the top of the first hill. it takes 10 seconds to get to the top of the hill. how much work is done? how fast are you travelling, on average, to the top of the first hill? find the  force, distance, time, work, average speed