Question

Rani and Sneha working separately can finish a job in 8h and 12h respectively. If they work for an hour alternately, Rani beginning at 9:00 am when will the job be finished?

Answer 1

Step-by-step explanation:

Rani - 8h

Sneha - 12h

LCM of both 24

let total work is 24 that is why Rani can do 3 works out of 24 in one hour and sneha can do 2 work per hour

now they works alternative means one one for Rani and next one hour for Sneha

the work is start at 9 am by Rani it means

5 work will be done in 2 hours

3+2+3+2+3+2+3+2+3+1

9sahi1/2 hours

means 9.5 hours

work was started at 9 am

9+9.30= 18.30 = 6:30 pm is answer