A cistern has a leak which would empty it in 6 hours. A tap is turned on which fills the cistern @10 litres per and then it is emptied in 15 hours . What is the capacity of the cistern?
A. 100litres
B. 166.66litres
C. 60.66 litres
D. none of these
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A-100ltr
Let total capacity be x kre
Leak emptied the cistern in 6 hrs
So leak works x/6 ltr/hr
Tap works 10lt/hr
When both work together they can emptied the tank in 15 hrs so
Total water in tank + total water filled by tap - total water removed by leak = 0
x - 10*15 - ( x/6) * 15 = 0
So x = 100 ltr
@Ruby, some data is missing in question. Check once again.