The time required for an elevator to lift a weight varies jointly as the weight and distance through which it is to be lifted and inversely as the power of the motor. It takes 30 seconds for a 10 horsepower motor to lift 100 ft. through 40 ? Not for sale Guide Question: in 40 seconds thout habente size of the motor is required to lift 800 pounds


1. What type of variation is involved in this problem? ​