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Verified Answer :

7/10 times x equals 10. x = 10/7. Now you have to multiply 2/5 by 10/7 as well, which equals 4/7, so he can mow 4/7 of an acre per hour

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Answer:

\(\frac{4}{7}\ acres\)

Step-by-step explanation:

we know that

Walter takes \(7/10\) of an hour to mow  \(2/5\) of an acre of lawn

so by proportion

Find how many acres will he mow in an hour

\(\frac{(7/10)}{(2/5)}\frac{hours}{acres}=\frac{1}{x}\frac{hour}{acres}\\\\x=(2/5)/(7/10)\\ \\x=\frac{4}{7}\ acres\)

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