Having the same capacity 9 taps fill up a water tank in 20 minutes. How many taps of the same capacity are required to fill up the same water tank in 15 minutes?
Answer & explanation
Correct answer: option 2
9 taps → 20 min
Total work = no. of pipes × total time
= 9 × 20 = 180
In 15 minutes → no. × 15 = 180
h = \(\frac{180}{15}\) = 12
No. of taps = 12