A can do a work in 40days, B in 60days. A alone start the work after 10days he left work. In how many days B can finish the work?	Select:
A) 20days
B) 15days
C) 30days
D) 45days
E) 50days
10days work of A = 10/40 = 1/4   remaining work = 1-1/4 = 3/4   B can finish 3/4 work = 60*3/4= 
<gadget id="calculator">60*3/4</gadget>
<output>45</output>
45days   Answer is 45days
<result>D</result>
A can do a work in 40days, B in 60days. A alone start the work after 10days he left work. In how many days B can finish the work?