A husband and wife can complete a certain task in 1 and 3 hours respectively. Their children, Rae and Herman, can complete the same task in 4 and 6 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?
Options
A) a)15:46 B) b)3:10 C) c)12:23 D) d)5:16 E) e)10:3
couples one hour work=1/1+1/3=4/3   so total time=3/4.   now, kids one hour work=1/4+1/6=5/12   so total time=12/5..   ratio=3/4:12/5=5:16   ans d)5:16
<result>D</result>
A husband and wife can complete a certain task in 1 and 3 hours respectively. Their children, Rae and Herman, can complete the same task in 4 and 6 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?