Examples 5 to 8 of  time and work

Parin Sir > Quantitative Aptitude (Maths) > Time and Work > Examples 5 to 8 of  time and work
17
Aug
Examples 5 to 8 of  time and work

(5)  A cistern has two taps which fill it in  10  minutes  and  15  minutes respectively. There is also a waste pipe in the cistern. When all the three are opened, the empty cistern is full in  30  minutes. How long will the waste pipe take t…

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