[填空题]
On the Persian Gulf, thu)c (j ycmot:/m klp;,ere is a small peninsula that c;(7m 9bilbh1x qsjwyg56 l8fp an be modelled by the equatiol j8gsb;p fyhl imw5xq(791b6n y=$-0.2 x^{3}+1.2 x^{2}-x$ where x and y are measured in kilometres, as shown in the following diagram. Points $\mathrm{P}$ and $\mathrm{Q}$ are on the coastline.
1. Find the coordinates of $\mathrm{P}$ is ( , ) and $\mathrm{Q}$ is ( , ) .
2. Find the furthest distance that the land protrudes from the coastline.
3 . Find the area of the peninsula，The area of the peninsula is given by A= km$^2$.
