A and B can do a work in 4 hours and 12 hours respectively. A starts the work at 6AM and they work alternately for one hour each. When will the work be completed? Choose the most appropriate option
A) 8 days	B) 5 days	C) 4 days	D) 6 days	E) 2 days
Work done by A and B in the first two hours, working alternately = First hour A + Second hour B   = 1/4 + 1/12 = 1/3.   Total time required to complete the work   = 2 * 3= 
<gadget id="calculator">2 * 3</gadget>
<output>6</output>
6 days.   Answer: 6 days
<result>D</result>
A and B can do a work in 4 hours and 12 hours respectively. A starts the work at 6AM and they work alternately for one hour each. When will the work be completed?