Question

ravi can do a piece of work in 15 hours while raman can do it in 12 hours. how long botk take to do it.woeking together?​

Answer 1

Answer:

As Ravi and Raman both do a piece of work in 27 hour so both can do this in 13.5 hour

Answer 2

Answer:

15+12=27hours this is the answer