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?
Answer & explanation
Correct answer: option 4
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 )