Question

26. Two pipes A and B can fill a cistern in 20 min and 25 min, respectively. Both the pipes are opened together but at the end of 5 min, the first is turned ofl, how long does it take to fill the cistern? (a) 16.25 min (b) 22 min (c) 18.75 min (d) 20 min

SSC CGL

Maths

Solution

4.0 (1 ratings)

( A ) 20 5 100 ( operatorname{gn} 5 min =9 times 5=45 ) units Remaining ( =5.5 ) curt ( operatorname{tin} e=frac{5^{n}}{4}=13 cdot 75 ) min to tal tirone ( =18.78 ) min