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A swimming pool 30 m long is 1 m deep at its shallow end and 4 m deep at its deep end. The pool is 14 m wide.
(a) Find the volume of water, in cubic metres, when the pool is full.
(b) A circular pipe of diameter 14 cm is used to empty the swimming pool. Water flows through the pipe at a rate of 5 m per second. Calculate the time it would take, to the
nearest minute, to empty the pool.