A husband and wife can complete a certain task in 1 and 2 hours respectively. Their children, Rae and Herman, can complete the same task in 4 and 7 hours, respectively. What is the ratio of the couple's time working together to complete the task to the children's time working together to complete the task?	Choose one:
A) a)11:42	B) b)3:10	C) c)12:23	D) d)5:18	E) e)10:3
couples one hour work=1/1+1/2=3/2   so total time=2/3..   now, kids one hour work=1/4+1/7=11/28   so total time=28/11..   ratio=2/3:28/11=11:42   ans a)11:42
<result>A</result>
A husband and wife can complete a certain task in 1 and 2 hours respectively. Their children, Rae and Herman, can complete the same task in 4 and 7 hours, respectively. What is the ratio of the couple's time working together to complete the task to the children's time working together to complete the task?