Question

two man can do a piece of work in 6 hours and 4 hours respectively after the first has worked for hours he os joined by the other. by when should the work be completed​

Answer 1

Answer:

The first men can do a piece of work =1/6

The second men can do a piece of work in =1/4

( The first worker completes 1/6 of the job per hour. After two hours , 1/3 is done and 2/3 of the job remains .)

By working together

They complete

1/6+1/4 =5/12 of the job per hour

2/3 of job × 1 hour / 5/12 job = 8/ 5 hours

= 1 hour and 36 minutes

The job takes a total of 3 hours and 36 minutes.