A and B can do a work in 5 days and 10 days respectively. A starts the work and B joins him after 2 days. In how many days can they complete the remaining work?  Choose the correct choice from the following answers
A) 7 days
B) 2 days
C) 5 days
D) 3 days
E) 6 days
2 days   2 days   Work done by A in 2 days = 2/5   Remaining work = 3/5   Work done by both A and 2 days in one day = 1/5 + 1/10 = 3/10   Remaining work = 3/5 * 10/3= 
<gadget id="calculator">3/5 * 10/3</gadget>
<output>2</output>
2 days.
<result>B</result>
A and B can do a work in 5 days and 10 days respectively. A starts the work and B joins him after 2 days. In how many days can they complete the remaining work?