11 uždavinys13 uždavinys
Sprendimas:
$$\frac{1}{t} = \frac{1}{t_{1}}+\frac{1}{t_{2}}$$
$$\frac{1}{t} = \frac{1}{9}+\frac{1}{18}$$
$$\frac{1}{t} = \frac{2}{18}+\frac{1}{18}$$
$$\frac{1}{t} = \frac{3}{18}$$
$$\frac{1}{t} = \frac{1}{6}$$
$$t = 6$$
Atsakymas: Per 6 valandas
11 uždavinys13 uždavinys