<p>Unless I’m missing something number 3 is wrong. The answer should be 18.
Let x be the distance between work and her home.
Time taken = distance / speed.
Time taken to work = x/45.
Time taken from work = x/30. </p>
<p>Total time = 1 hr. So x/45 + x/30 = 1
5x/90=1
X=90/5
X=18.</p>
<p>Number 1:
Let n be the number of days taken to reach $1000.
She earns k dollars per day. And spends k/3 dollars per day. So she saves k-(k/3) = 2k/3 dollars per day.
Money saved in n days = 1000.
n<em>(2k/3)=1000.
n=1000/(2k/3)
n=(3</em>1000)/(2k)
n= 1500/k</p>