Question

Walter takes 7/10 of an hour to mow 2/5 of an acre of lawn. At this rate, how many acres will he mow in an hour?

Answer 1

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

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

Answer 2

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