The time required for an elevater to lif...

The time required for an elevater to life a weight varies directly with the weight and the distance through which it is to be lifted and inversely as the power of the motor. If its takes 30 seconds for a 10 hp moter to lift 100 lbs through 50 feet, what size of moter is requiered to lift 800 Ibs in 40 seconds through 40 feet?

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