Question

( 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

# 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

Solution