SSE JE Electrical Engineering 28 Oct 2020 Shift 1 Papers

Below Diagram shows the shortest distance between Roshan's guest house and the park denoted by point P and Q respectively.Now, Triangle "PSQ" is a right-angled triangle, so using Pythagoras Theorem:
${\mathrm{PQ}}^2={\mathrm{PS}}^2+{\mathrm{SQ}}^2$
${\mathrm{PQ}}^2={\left(5\right)}^2+{\left(12\right)}^2$
${\mathrm{PQ}}^2=25+144$
${\mathrm{PQ}}^2=169$
$\mathrm{PQ}=\sqrt{169}$
$\mathrm{PQ}=13.$
Hence, the correct answer is "13 km".