A alone can fill a tank in 16 mins and B alone can fill the same tank in lsquo X rsquo mins C alone ...........

Quantitative Aptitude(IBPS CL) Time and work

A alone can fill a tank in 16 mins and B alone can fill the same tank in ‘X’ mins. C alone can empty the tank in 12 mins. A, B, and C together take $34\frac{2}{7}$ min to fill the tank. What is the time taken by B alone to fill the tank?