The figure shows Tap P, Tap Q and an empty tank with a capacity of 59.5 litres. Water flows Tap P at 3.2 litres per minute and from Tap Q at 2.7 litres per minute. Tap P was turned on first. Tap Q was turned on 2 minutes later. The taps were turned off at the same time when the tank was completely filled without overflowing. How much water flowed from Tap P?