# A forms a wall in 10 days and B forms it in 15 days. A and B start the work of forming wall together...

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A forms a wall in 10 days and B forms it in 15 days. A and B start the work of forming wall together but after 2 days A leaves the work. How many days are required for making the remaining wall by B?

posted Mar 3, 2016

Another 10 days.
.
Per day A does 1/10 of the wall and B 1/15 of the wall.
After the 2nd day 2*1/10 + 2*1/15 = 5/15 of the wall has been completed.
B needs another 10 days to finish the wall.

One Day work of both (A+B)=1/10+1/15
=5/30
=1/6
Two Days work of (A+B)=2/6
=1/3
Reamaining work=2/3
Time taken by B to complete the remaining work-2*15/3
=10 Days

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