\(\frac{3}{4}\) part of the tank is filled by a motor pump in 15 minutes, then the rest part of the tank will be filled in
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 5 minutes
The pump fills the tank at a steady rate, so the time taken is proportional to the part filled.
Part left to fill: \(\displaystyle 1-\frac{3}{4}=\frac{1}{4}\), one third of the part already filled
Time for it: \(\displaystyle \frac{15}{3}=5\) minutes