If the family walked 2/5 of a mile in 2/7 of an hour their MPH would be 2.8mph
Based on the distance of Planet X from Earth and the distance of Planet Y, Planet X is 5 ³/₅ light-years farther away.
<h3>How much farther is Planet X from Earth?</h3>
To find how out how much farther planet X is from Planet Earth than Planet Y, subtract the distances:
Solving gives:
= 8 ¹/₅ - 2 ³/₅
= 41/5 - 13 / 5
= 28/5
= 5 ³/₅ light-years
Find out more on light-year distance at brainly.com/question/76984
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Let <em>x</em> and <em>y</em> be the required amounts of the 35% and 60% acid solutions, respectively.
<em>x</em> liters of 35% acid solution contains 0.35<em>x</em> L of acid.
<em>y</em> liters of 80% acid solution contains 0.80<em>y</em> L of acid.
Together, a combined (<em>x</em> + <em>y</em>) L of mixed solutions contains (0.35<em>x</em> + 0.80<em>y</em>) L of acid.
You want to end up with 60 L of 65% acid solution, which means
<em>x</em> + <em>y</em> = 60
0.35<em>x</em> + 0.80<em>y</em> = 0.65 × 60 = 39
Solve for <em>x</em> and <em>y</em> :
<em>y</em> = 60 - <em>x</em>
0.35<em>x</em> + 0.80 (60 - <em>x</em>) = 39
0.35<em>x</em> + 48 - 0.80<em>x</em> = 39
0.45<em>x</em> = 9
<em>x</em> = 20
<em>y</em> = 40
