Question

Marneshia walked three over eight of a mile in three over five of an hour. What equation can be used to calculate her unit rate in miles per hour?
three eighths over three fifths = five eighths mile per hour
three eighths over three fifths = one and three fifths miles per hour
three fifths over three eights = one and three fifths miles per hour
three fifths over three eights = five eighths mile per hour

Answer 1

Answer:

three eighths over three fifths = five eighths mile per hour which is the same as $\frac{3}{8}$/$\frac{3}{5}$=$\frac{5}{8}$miles per hour

Explanation:

You need to use the rule of three of maths.

1)  $\frac{3}{8}$ miles in $\frac{3}{5}$ hours

It´s the same as $\frac{3}{8}$ miles----------------------$\frac{3}{5}$ hours in maths terms.

2) I need to know how much she wuold have walked in 1hour to calculate miles per hour. I apply the rule of three:

$\frac{3}{8}$ miles----------------------$\frac{3}{5}$ hours

X miles----------------------1hour

I can calculte X by solving: 1hour * $\frac{3}{8}$ miles /$\frac{3}{5}$ hours =$\frac{5}{8}$miles per hour which is the same as the first option

$\frac{3}{8}$ miles /$\frac{3}{5}$ hours =$\frac{5}{8}$miles

three eighths over three fifths = five eighths mile per hour