A rectangular water tank measures 15 m × 6 m at top and is 10 m deep. It is full of water. If water is drawn out lowering the level by 1 metre, how much of water has been drawn out?
- (a)45,000 litres
- (b)90,000 litres
- (c)4,500 litres
- (d)900 litres
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Official answer(b) 90,000 litres