Solve a problem in two ways. Define what of them is more convenient? Why?. The cities of A and B at the same time in one direction were left by two trains. Speed of the first train is equal 80 km/h, and the speed of the second going after the first,-110 km/h. The meeting took place in 4 hours after departure of trains. At what distance the cities of A and B from each other are?

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1 way 110 * 4 = 440 km distance from the city And to the meeting place of 80 * 4 = 320 km distance from the city In to the meeting place 440 - 320 = 120 km distance from the city And to the city B 2 way 110 - 80 = 30 km/h the speed of rapprochement is 30 * 4 = 120 km distance from the city And to the city of B110 - 80×4=120 (km) - between the cities
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Answer add