Question

a A and B individually can do a work in 8 hours and 12 hours respectively. A worked first for 2 hours and then left. How long will B take to finish the remaining part of the work ?​

Answer 1

Answer:

B will take 3 hours to finish the remaining part of the work

Step-by-step explanation:

Let the quantity of the work is x unit.

To do this complete work A  will take 8 hours and B will take 12 hours.

    A worked for first 2 hours and then left.

∴ Remaining quantity of the work is 2x/8=x/4 unit.

B does x unit work in 12 hours

B does x/4 unit work in  12x/4x = 3 hours