Help to solve please a problem, Solved, but somnevayemsyaiz TWO GORODOV of NASTRECHU there were TRAINS AND MET ChEREZ18 of HOURS.OPREDELITE the SPEED of EACH TRAIN IF DISTANCE BETWEEN the CITIES of 1620 KM, And the SPEED of ONE TRAIN 10 KM MORE to solve ANOTHER actions, but not the equation

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1) 18:2=9(ch) - a half of time 2) 1620:9=180 (km/h) - the speed of rapprochement 3)(180-10): 2=85 (km/h) - the speed of 1 train 4) 85+10=95 (km/h) - speed 2 trains -------------------------------------------------------------------------------note as the best thanks in advance
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Answer add