Six identical taps, all turned on together, fill an empty tank in 40 minutes. How many such taps, all turned on together, are needed to fill the same empty tank in 24 minutes?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 10
The taps are identical, so the work needed to fill the tank is number of taps × time, and it stays the same.
Work to fill the tank \(=6\times40=240\) tap-minutes
Taps needed for 24 minutes \(\displaystyle =\frac{240}{24}=10\)
10 taps are needed.