Two pipes, when working one at a time can fill a cistern in 2 hours and 3 hours, respectively while a third pipe can drain the cistern empty in 6 hours. All the three pipes were opened together when the cistern was \( \frac{1}{6} \) full. How long will it take for the cistern to be completely full?
1 hour
1 hour 20 minutes
1 hour 30 minutes
1 hour 15 minutes
Which of the following solutions is alkaline?
[H+] = 1 × 10-4 Mol/l
[H+] < 1 × 10-7 Mol/l
[H+] > 1 × 10-7 Mol/l
[H+] = 1 × 10-7 Mol/l
If three groups could be formed using the given figures only once, these groups would be _____.
(1,8,7), (2,6,9) and (4,3,5)
(2,5,7), (1,6,9) and (4,3,8)
(1,5,7), (2,6,8) and (4,3,9)
(1,5,7), (2,6,9) and (4,3,8)
In the below Venn diagram which number space represents the girls who are athletes but not disciplined?
Choose the correct water image of the given problem figure from the answer figures.