CUET Preparation Today
CUET
General Test
Numerical Ability
Pipes and Cisterns
Tap P can fill a cistern in 6 hours and tap Q can empty the cistern in 20 hours. If both taps are kept opened simultaneously, then the time taken by both to fill the cistern:
602
607
509
506
Total work = efficiency × time
Total efficiency = 10 - 3 = 7
Both ( P + Q ) will take time → 607 = 607 hours
