Let \( C_{1} \) and \( C_{2} \) are circles defined by \( x^{2}+y^{2}-20 x+64=0 \) and \( x^{2}+...

Let \( C_{1} \) and \( C_{2} \) are circles defined by \( x^{2}+y^{2}-20 x+64=0 \) and \( x^{2}+y^{2}+30 x+144=0 \). W The length of the shortest line segment \( P Q \) that is tangent to \( \mathrm{C}_{1} \) at \( \mathrm{P} \) and to \( \mathrm{C}_{2} \) at \( \mathrm{Q} \) is - (A) 15 (B) 18 (C) 20 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live