Question

Ravi can do a piece of work in 15 hours while raman can do it in 12 hours. How long will both take to do it,working together?

Answer 1

ravi =15
raman=12
lcm=60
efficiency of ravi=4 and raman=5
so total units done together=4+5=9
total hr=60/9=6 6/9 hr. please mark it as a brainliest answer