railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Time and Work Pipe and Cistern

To fill a cistern, pipes X, Y and Z take 10 minutes, 30 minutes and 15 minutes respectively. What is the time that the three pipes together will take to fill the cistern? 

1
2 min
2
8 min
3
7 min 
4
5 min 
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