Ravi, Mohan and Govind can complete a task in 12 days, 10 days and 15 days, respectively. In how many days can Ravi, Mohan and Govind together complete the same task?

4

Ravi = 12 days, Mohan = 10 days, Govind = 15 days,

⇒ Time required by all of the to complete the work together = \(\frac{60}{5+6+4}\) = \(\frac{60}{15}\) = 4 days,    ..(\(\frac{Work}{Efficiency}\) = Time)