Two planes start from Miami airport and fly in opposite directions. The second plane starts 40 minutes after the first plane but it's speed is 90 mph faster. Find the speed of each plane when 3 hours after the first plane departs the planes are 2800 miles apart

i think is g(1)=-1.

hope that i can

place r′ so that qr′ is parallel to the tangent.

now we get that ∠r′py=∠pr′q, where y is on the tangent, on the opposite side of p from x.

also, because of the symmetry, ∠r′py=∠qpx.

finally, note that no matter where we place r, as long as it's on the correct arc, we have ∠prq=∠pr′q.

stringing all these equalities together, we end up with ∠prq=∠qpx.

this picture will show how its going to look like.

hope this by jack monhen