Please help to solve settlements the being 30 km were left by two riders in the direction the lake. speed of the rider who left distant to the lake the settlement of 12 km of hour from near 6 km/h through what time one garden will catch up with another?

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S = v * t - a formula of a way of s = 30 (km) - distance between settlements of v = 12 - 6 = 6 (km/h) - rapprochement speed at the movement after t - t = 30: 6 = 5 (h) Answer: in 5 hours one rider will catch up with another.
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