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

Answer:

6.67 hours = 6 hours 40 minutes

Step-by-step explanation:

Take LCM of 15 and 12 = 60.

So, let there be 60 works.

So Ravi does 60/15 = 4 works in an hour.

Raman can do 60/12 = 5 works in an hour.

So together they can do 5+4 = 9 works in an hour.

They will take 60/9 = 6.67 hours = 6 hours 40 minutes

Answer 2

Answer:

3/20

Step-by-step explanation:

ravi 1hr work =1/15

raman=1/12

so adding up of these gives togethers work

1/15+1/12

3/20