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

Question

2 years ago

5

pp working together?

1 answer:

alekssr [168] · Answer 1 · 2023-07-07T07:14:06+03:00

The time it will take Jack and Chris to program the app when they work together is 4.24 hours.

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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