The time it will take Jack and Chris to program the app when they work together is 4.24 hours.
<h3>What is a rate?</h3>
Rate is a ratio that compares two different quantities which have different units.
Jack program an app in 9 hours. Therefore, the rate is as follows;
1 / 9
Chris can program the same app in 8 hours. Therefore, the rate is as follows;
1 / 8
When they do it together.
1 / 9 + 1 / 8 = 8 + 9/ 72 = 17 / 72
1 / t = 17 / 72
cross multiply
72 = 17 t
t = 72 / 17
t = 4.23529411765
t = 4.24
Therefore, the time it takes for both of them is 4.24 hours.
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There are only two steps to solve this problem.
The first step is to multiply the whole number (8) by the numerator (1). 8 times 1 equals 8, so 8 is our new numerator and our fraction should look like: 8/4.
The second step is to simplify it down even further. To do so, you need to figure our what multiples by 4 to get the answer of 8. 4 times what equals 8? The answer should be 2, since 4 times 2 multiples to 8.
The answer is: 2.
D. Give performers an unfair advantage
Let’s talk about option A; Drugs that athletes take (for e.g. steroids) they INCREASE athletes muscle mass & endurance. They look bigger & muscular than a normal natural athlete.
Option B is also incorrect because there is no drugs that are legal in sports
Option C - It increase the athletes performance and your extremely energetic. You are doing what an natural cannot do in a short period of time.
SO OPTION D - It’s unfair to the natural ones
