Question

a can do a piece of work in 15 days and B alone can do it in 10 days we worked at it for 5 days and then he was a alone can finish the remaining work in​

Answer 1

Answer:

2.5 days

Step-by-step explanation:

A can do the work in 15 days.

B can do the work in 10 days.

Together they can do the work in = 1/(1/15 + 1/10) = 30/ ( 2 + 3 )= 6 days.

It is not clear whether they are working together or B alone is doing the work.

Assuming that B works alone and leaves after 5 days, 50% of the work would have been completed.

Then for completing the balance work, A will need = 15/100 * 50 = 7.5 days.

If they have worked together and B leaves after 5 days, then 5/6 th of the work would have been over.

Hence, for finishing the balance work, A will take = 15 * 1/6 = 2.5 days