Question

4. A and B can do a certain job in 5 h, and A alone can do it in 8 h. How long will B take to do
the job alone?​

Answer 1

Answer:

andwer

Step-by-step explanation:

B will need 13 hours and 20 minutes.

Explanation- In order to complete 100% of work alone, A needs 8h time. So in 5 hours(300 minutes), he will complete 5/8 portion of total work i.e. 62.5% of total work. It means that in 5 hrs, B is doing 37.5% (100–62.5) of total work.

Thus in order to complete 100% of work alone, B will require (300/37.5)*100 minutes, which means a total of 800 minutes.

Thus B will need 13 hours 20 minutes to complete the same work all alone.

Peace.

Answer 2

Answer:

B will also complete the same job alone in 8 hours