Work out the equation and solve a problem. From two settlements between which distance of 18 km, at the same time towards each other there were two pedestrians. They met in 2 h. One of them went with a speed of 4 km/h. With what speed did the second transition go? PLEASE MAKE SHORT RECORD!

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S = 18 km of t = 2 h v1 = 4 km/h of v2 = x (x + 4) * 2 = 18 x + 4 = 18: 2 x + 4 = 9 x = 9 - 4 x = 5 km/h speed vtorogovot approximately so, please
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Answer add