How many kilometers is the distance between the two stations known to be 4 kilometers?

How many kilometers is the distance between the two stations known to be 4 kilometers?

(4 × 2) / (65 + 6 − 55 + 6) = 8 / 111, = 88 km. A: the distance between the two stations is 88 km

The two trains leave from a and B at the same time and meet at 48km from the midpoint 4 hours later. It is known that the local train is 37 times the speed of the express train. What are the speeds of the express train and the local train? How many kilometers are there between a and B?

Speed of express train: (48 × 2 △ 4) / (1 − 37) = 24 △ 47 = 42 (km) speed of local train: 42 × 37 = 18 (km) distance between a and B: (42 + 18) × 4 = 60 × 4 = 240 (km) answer: speed of express train is 42 km per hour, speed of local train is 18 km per hour, distance between a and B is 240 km

The two trains leave from a and B at the same time and meet at 48km from the midpoint after 4 hours. It is known that the slow speed is 5 / 7 of the fast speed,
What is the speed of the express train and the local train respectively? How many km is the distance between a and B?

If the speed of the fast train is a km / h, the speed of the slow train is (5 / 7) a km / h, and the distance between a and B is B km. 4A + 4 (5 / 7) a = b4a = (B / 2) + 48. Solving the equations, we get: (B / 2) + 48 + (5 / 7) [(B / 2) + 48] = B (B / 2) + 48 + (5b / 14) + (240 / 7) = BB - (6B / 7) = 576 / 7b / 7 = 576 / 7