Lindsay can paint a room in 8 hours at a constant rate. If Lindsay paints the room for 4 hours and Joseph paints the rest of the room, who works at 1/2 constant rate of Lindsay. How long will it take for Joseph alone to paint the rest of the room? Choose the correct choice from the following options.
A) 4hrs	B) 8hrs	C) 10hrs	D) 12hrs	E) 16hrs
Lindsay will do 4/8 in 4 hrs, so Lindsay does 1/2 of the work ..   Therefore, Joseph will do the remaining 1/2 work alone..   As the speed of Joseph is 1/2 rate of Lindsay, Joseph will do the 1/2 work in same time that Lindsay takes to complete full job...   ans 8   8hrs
<result>B</result>
Lindsay can paint a room in 8 hours at a constant rate. If Lindsay paints the room for 4 hours and Joseph paints the rest of the room, who works at 1/2 constant rate of Lindsay. How long will it take for Joseph alone to paint the rest of the room?