Reena, Veena and Vimla can do a work in 4 h, 8 h and 12 h respectively. In how much time will they finish the work working together?

$2\frac{2}{11}$h

Reena = 4 hours,

Veena = 8 hours,

Vimla = 12 hours,

⇒ Time required to complete the total work together = \(\frac{24}{6+3+2}\) = \(\frac{24}{11}\) =\( { 2}_{11 }^{2 } \) hours.       ..(\(\frac{Work}{Efficiency}\) = Time )