Silly rocket question
The question about the rocket:
6.) A rocket engine that takes off from earth burns 10,000 pounds of fuel in 15 minutes, and is able to lift 20,000 pounds total for that time period (including the rocket fuel itself). If a payload that weighs 20,000 pounds is needed to be transported for one hour, and unused rocket engines are dropped in stages after their fuel has been exhausted, how many rocket engines must be used to transport the payload for that time period?
Is so confusing and does not make any logical sense!!!
Fix this question!!!