Quantitative Aptitude Time and Work Pipe and Cistern

R and S are employed to fill a cistern. R fills 4 litres in 3 minutes and S fills 3 litres in 4 minutes. In how much time will they fill 75 litres when working together?

1

16 minutes

2

36 minutes

3

42 minutes

4

14 minutes

5

12 minutes

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