Two pipes A and B fill a tank. Pipe A fills the tank thrice as fast as Pipe B. lf both pipes are kept open together when the tank is empty, the tank will be full in 18 minutes. How long will pipe B alone take to fill the tank?

A) 72 minutes
B) 64 minutes

C) 58 minutes
D) 50 minutes

Correct answer:
A) 72 minutes

Description for Correct answer:
\( \Large \frac{1}{\frac{B}{3}}+\frac{1}{B}=\frac{1}{18}\ or\ \frac{3}{B}+\frac{1}{B}=\frac{1}{18} \)

or \( \Large B = 18 \times 4 \) = 72 min.

Please provide the error details in above question

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