1.

1). 2.5 days2). 4 days3). 5 days4). 1.5 days

Answer»

The part of work done by A in 1 DAY = 1/10

The part of work done by B in 1 day = 1/15

Let B work for X days after A left the work. 

According to the QUESTION

5(1/10 + 1/15) + x/15 = 1

⇒ 5(3 + 2)/30 + x/15 = 1

⇒ 5/6 + x/15 = 1

⇒ x/15 = 1 - 5/6

⇒ x/15 = 1/6

⇒ x = 15/6 = 5/2

⇒ x = 2.5 days



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