Question

Joe walked four over nine of a mile in four over five of an hour. What is his unit rate in miles per hour?

four ninths over four fifths = five over nine mile per hour
four fifths over four ninths = one and four fifths miles per hour
four ninths over four fifths = one and four fifths miles per hour
four fifths over four ninths = five over nine mile per hour

Answer 1

@Shadow

Answer 2

can you help me?

Answer 3

So first you want to convert to the same denominator.

Right now you have 4/9mile in 4/5hour.

\[\frac{ 4 }{ 9 } \times \frac{ 5 }{ 5 } = \frac{ 20 }{ 45 }\]
\[\frac{ 4 }{ 5 } \times \frac{ 9 }{ 9 } = \frac{ 36 }{ 45 }\]

20/45mile in 36/45hour

\[(\frac{ 20 }{ 45 } \div \frac{ 36 }{ 45 }) = \frac{ 20 }{ 45 } \times \frac{ 45 }{ 36 } = \frac{ 20 }{ 36 } = \frac{ 5 }{ 9 }mph \]

Answer 4

ok

Answer 5

Just analyze what I wrote and you should be able to find the answer.

Answer 6

im confused

Answer 7

do I have to multiply 20/45 and 45/36 orr divide it

Answer 8

um @Shadow

Answer 9

When you divide two fractions, you must multiply the second fraction by the reciprocal. Sorry he's a lazy person.

Answer 10

\[\frac{ a }{ b }\div \frac{ c }{ d }~ is~the~same~thing~as~\frac{ a }{ b } \times \frac{ d }{ c }\]

Answer 11

ohhhhhhhhh got it

Answer 12

You must flip the second fraction.

Answer 13

Then you multiply across and he got the answer \[\frac{ 5 }{ 9 }\]

Answer 14

so I just gotta find the same answer but from the answer choices?