From two stations, the distance between them is 28 km, 2 high-speed trains left at the same time in opposite directions.
| November 25, 2020 | education
From two stations, the distance between them is 28 km, 2 high-speed trains left at the same time in opposite directions. The first train travels 20 km less than the second in half an hour. How fast was the first train traveling if, 3 hours after the departure, the distance between them was 730 km?
730-28 = 702 (km) is the distance that two trains have traveled.
3 * 2 = 6
20 * 6 = 120 (km) – the train passed 120 km 2 than the first.
702-120 = 582 (km) – distance traveled by 2 trains.
582/2 = 291 (km) – the first train passed.
291/3 = 97 (km / h) -speed of 1 train.
Answer: 97km / h
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