Water in Tank A:
Volume = 1.5 × 1.0 × 0.60 = 0.9 m³
Water already in Tank B:
Volume = 1.2 × 0.75 × 0.10 = 0.09 m³
Total water in Tank B after pouring = 0.9 + 0.09 = 0.99 m³
Base area of Tank B = 1.2 × 0.75 = 0.9 m²
Final depth = 0.99 ÷ 0.9 = 1.1 m
Final Answer: 1.1 m