UMES maintain a courier plane to transport company executives back and forth between headquarters and plant 250 miles away. On the first leg the pilot flew 10 mph. on the return leg the average was 30mph. If the pilot spent a total of four hours in the air, what would the average speed of the courier plane be with no wind?

Zelon Pharmaceuticals maintain a courier plane to transport company executives back and forth between the company headquarters and the main manufacturing plant 250 miles away. Today the pilot flew from headquarters to the plant, picked up the chief of Operations, and returned to headquarters. On the first leg of the trip, the pilot flew against a headwind averaging 10 mph. On the return leg, the average tailwind was 30 mph. If the pilot spent a total of four hours in the air, what would the average speed of the courier plane be with no wind?

Apr 22nd, 2015

I wrote it exactly the way the teacher wrote the word problem. I don't understand it neither.