In ∆ABC, The length of sides AB, BC and AC are 18 cm, 9 cm and 12 cm respectively. In ∆PQR, The length of sides PR, QR, PQ are 6 cm, 3 cm and 4 cm respectively. Also given that ∠A and ∠B are 45° and 60° respectively. Find the value of ∠Q.
1
75°
2
160°
3
120°
4
115°