10 women can do a piece of work in 6 days, 6 men can do same work in 5 days and 8 children can do it in 10 days. What is the ratio of the efficiency of a woman, a man and a child respectively?

• 4 : 6 : 3
• 4 : 5 : 3
• 2 : 4 : 3
• 4 : 8 : 3