1 5/7 hours
≈ 1 h 43 m
- Step-by-step explanation:
Tim 4 hours => 1 hours = 1/4 house
Amanda 3 hours => 1 hours = 1/3 house
Both 1 hour = ³⁾1/4 + ⁴⁾1/3 = (3+4)/12 = 7/12 house
How long will it take for both of them to clean the house together ?
12/12 (full house) : 7/12 =
= 12/12 ₓ 12/7
= 12/7 hours
= 1 5/7 hours
≈ 1 h 43 m
