A large river basin, with a watershed area 125,000 km3 is divided into six sub-basin with drainage area of (a) 5,200, (b)18,600 km2 (c) 32,400 km2, (d) 20,800 km2 (e) 37 200 km2, and (f) 10,800 km2. The average annual precipitation for each sub basin is (a) 981 mm, (b) 752 mm (c) 678mm, (d) 495 mm, (e) 520 mm, and (f) 504 mm. What is the average, annual precipitation for the overall 125,000 km2 river basin?
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