Question
PSLE
The figure shows Tap R, Tap S and an empty tank with a capacity of 48.8 litres. Water flows Tap R at 1.4 litres per minute and from Tap S at 3.4 litres per minute. Tap R was turned on first. Tap S was turned on 4 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 R?
4 m

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PSLE
The figure shows Tap R, Tap S and an empty tank with a capacity of 48.8 litres. Water flows Tap R at 1.4 litres per minute and from Tap S at 3.4 litres per minute. Tap R was turned on first. Tap S was turned on 4 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 R?