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Natasha2012 [34]
3 years ago
8

Jack and Jill are brother and sister. Jack rakes the yard in 5 hours and Jill rakes the yeard in 8 hours. Mom says to rake the y

ard together how long will that take? ( answer as a mixed fraction)
Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
8 0
Given that <span>Jack rakes the yard in 5 hours and Jill rakes the yeard in 8 hours. Let the amount of time that it takes them to rake the yard together be t, then:

\frac{1}{t} = \frac{1}{5} + \frac{1}{8}  \\  \\ = \frac{8+5}{40} = \frac{13}{40}  \\  \\ \therefore t= \frac{40}{13} =3 \frac{1}{13}\ hours</span>
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