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Paha777 [63]
2 years ago
5

Jack can program an app in 9 hours. Chris can program the same app in 8 hours. How long would it take them to program the same a

pp working together?
Mathematics
1 answer:
alekssr [168]2 years ago
6 0

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.

learn more on rate here: brainly.com/question/23895068?referrer=searchResults

#SPJ1

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