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Buses and trucks and two cities from party a and b have relatively open Buses and trucks and two cities from party a and b have relatively open, four hours later, the two cars to meet again, buses, 3 hours to city b from the city and trucks, 90 kilometers, how many kilometers apart of two cities? [with equations. 4 (x, y) = s 7x = s, 7y 90 = s one for the bus speed, the x, y for truck speed for party b s distance of two cities. Three unknown, three equation, the solution will get an answer!!!!!!!!!! The solution: s = 360 kilometers! Thank you!!!!!!!!!! Set for x, truck speed bus speed for y apart: 4 (s) = s x y, Buses arrive 3 hours: 3 x = 4y observed, Van driving for three hours, it is proved 4y 90km - 3 x = 90: j solution to s = 360 equations.
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