Technical 2617

Pupils work in groups of two on technical work in the school to make a birdhouse. If Tomáš worked alone, he would make the booth in 4 hours. Richard would do it in 2 hours. If they work together, how many hours will it take them to complete it?


t = 1:20 h Wrong answer

Step-by-step explanation:

(1/4+1/2)t = 1

(1/4+1/2)·t = 1

3t = 4

t = 4/3 = 1.33333333

t = 4/3 ≈ 1.333333

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