Two pipes A and B can fill an empty tank in 3hrs and 5hrs respectively. Pipe C can empty the tank in 4hrs. If the three pipes A, B and C are opened at the same time find how long it will take for the tank to be full.

Question

1 Answer

anonymous · Answer 1 · 2021-08-13T11:12:54+0000

¹/₉ +¹/₅ -¹/₄ = ^20+12-18/₆₀
= ¹⁷/₆₀
¹⁷/₆₀=1hr
1= 1 x ⁶⁰/₁₇
⁶⁰/₁₇ = 3.5294118
= 3.529 hrs