Question

Epoy and junjun can do a certain job in 10 hours if they work together. If Epoy can do the job in 15 hours, how long will it take junjun to do the job alone?

Answer 1

Answer:

Junjun will take 30 hrs to do job alone

Step-by-step explanation:

Epoy can do the job in 15 hours

=> Epoy 1 hr Work = 1/15

Let say junjun can do the job in J hours

=> Junjun 1 hr job = 1/J

Epoy and junjun can do a certain job in 10 hours

=>Epoy and junjun together 1 hr job = 1/10

1/15 + 1/J = 1/10

=> 1/J = 1/10 - 1/15

=> 1/J = (3 - 2)/30

=> 1/J = 1/30

=> J = 30

Junjun will take 30 hrs to do job alone