Complete 2833

The tiler covered 3/5 of the wall with tiles in two hours and 45 minutes. How long did it take to complete the entire lining area at the same power? How long did the whole job take him?

Result

a = 3:20 h Wrong answer
b = 4:35 h Wrong answer

Step-by-step explanation:


3/5 b = 2+45/60
a = b-2+45/60

3/5·b = 2+45/60
a = b-2+45/60

36b = 165
60a-60b = -75

Pivot: Row 1 ↔ Row 2
60a-60b = -75
36b = 165


b = 165/36 = 4.58333333
a = -75+60b/60 = -75+60 · 4.58333333/60 = 3.33333333

a = 10/3 ≈ 3.333333
b = 55/12 ≈ 4.583333

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