sunita123 wrote:
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 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?
a)15:46
b)3:10
c)12:23
d)5:18
e)10:3
We know work done together:
\(\frac{ab}{a + b}\)
For Husband and Wife we can write:
\( \frac{1}{1} +\frac{1}{2} = 2 *\frac{1}{2} + 1 =\frac{2}{3} \)
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