Crop Duster

Congratulations, you found the secret FAMPO hideout. Unfortunately, by the time you figured out the location and flew there, they were gone! Fortunately, they left some scraps of paper in the trash can that might help you figure out their plan.

The first paper has a contract for a crop duster to dispense a special chemical over a specific rectangular area of jungle. The second is a packing slip for delivery from FAMPO Laboratories of "ALPV" which your partner figured out stands for Amur Leopard Polio Virus. They must have modified the human polio virus to attack Amur leopards--those sneaky bastards!

The third set of papers has the map above and one page of calculations but the other ones are missing. You recognize immediately that the blue areas are the current locations of the Amur leopard--but which one are they going to target? From the one page of calculations, you found these notes:

• Vladivostok area is 50 km longer than it is wide
• Not enough ALPV to cover Vladivostok--damn!
• Need to reduce the area sprayed by 3600 km² 
• Why didn't we get more ALPV? We should fire all FAMPO chemists immediately!
• If we reduce the width and height by 30 km each, we can cover the new area!
• That means we can instead target the area near [...bottom of page--notes end here]

All you need to do is figure out the dimensions of the new target area and you can go stop the crop duster!  Good luck.