From the two cities, the distance between which is equal to 490 km left at the same time towards each other two trains
| December 18, 2020 | education
From the two cities, the distance between which is equal to 490 km left at the same time towards each other two trains and met in 3.5 hours. The speed of the first train was 12 km h more than the speed of the second. At what speed the trains went.
Let the speed of 1 train = x
Then the speed of the train 2 x + 12
It is known that the speed of the first train was 12 km / h more than the speed of the second
Let’s make the equation:
3.5x + 3.5 (x + 12) = 490
7x + 42 = 490
7x = 490-42
7x = 448
x = 448: 7
x = 64 (km / h) -speed of the first train
64 + 12 = 76 (km / h) -speed of the second train
Answer: 64 km / h speed of the first train, 76 km / h speed of the second train
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