a buiness women gets in a car and heads out at 8 am and travels east from des moines to iowa city which is 80 miles then she heads north to la ceosse which is another 240 miles her average speed is 70 mph her partner sees that she forgot her sunglasses and heads to the airport to charter their executive jet dierectly from des moines to la crosse. if the flight departs desmonines at 12 noon how fast does the plane need to fly if the partners meet at la crosse at the same time