Question 73

To fill a certain tank, pipes A, B and C take 20 minutes, 15 minutes and 12 minutes respectively. If the three pipes are opened every alternate minute, how long will it take to fill the tank?

Part filled by 3 pipes in 3 minutes = $$\frac{1}{20} + \frac{1}{15} + \frac{1}{12} = \frac{3 + 4 + 5}{60} = \frac{1}{5}$$

1/5th of the tank is filled in 3 minutes then whole tank is filled in 5 x 3 = 15min

Hence, option D is the correct answer.

Create a FREE account and get:

  • All Quant Formulas and Shortcuts PDF
  • 100+ previous papers with solutions PDF
  • Top 5000+ MBA exam Solved Questions for Free

MAT Quant Questions | MAT Quantitative Ability

MAT DILR Questions | LRDI Questions For MAT

MAT Verbal Ability Questions | VARC Questions For MAT