Solving the equation: at 8 a.m., a car drove 40 kilometers from a to B in the first hour, one hour later than the original plan, so it drove at a speed of 50 kilometers per hour At 8 o'clock in the morning, a car drove 40 kilometers from a to B in the first hour. At this speed, it was one hour later than the original plan. So it drove at 50 per hour, one hour earlier than the original plan. How long was the original plan

Solving the equation: at 8 a.m., a car drove 40 kilometers from a to B in the first hour, one hour later than the original plan, so it drove at a speed of 50 kilometers per hour At 8 o'clock in the morning, a car drove 40 kilometers from a to B in the first hour. At this speed, it was one hour later than the original plan. So it drove at 50 per hour, one hour earlier than the original plan. How long was the original plan

40*(50-40)=400
(400/40+400/50)/2
=(10+8)/2
=9
The original plan is 9 hours

If someone wants to drive from place a to place B within the prescribed time, if he drives at the speed of 50 km / h, he will arrive at place B 25 minutes late. If he drives at the speed of 70 km / h, he will arrive 35 minutes in advance, so as to find the distance between Party A and Party B

Hello
25 minutes = 5 / 12 hours
35 minutes = 7 / 12 hours
Let the estimated time be X
50（x+5/12）=70(x-7/12)
50x+250/12=70x-490/12/6
70x-50x=250/12+490/12
20x=740/12
x=37/12
The distance between the two places is 50x (37 / 12 + 5 / 12) = 50x7 / 2 = 175km
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A car drove 40 kilometers from a to B in the first hour. At this speed, it was one hour later than the original plan, so it drove at the speed of 50 kilometers per hour. As a result, it was one hour earlier than the original plan?

If the original planning time is m, then 40x (M + 1) = 40 + 50x (m-2), then M = 10

There are two stations a and B 650 km apart on the same road. The jeep departs from station a, 52 km per hour, and the car departs from station B, 78 km per hour
How long does it take for two cars to leave at the same time? The distance between the two cars is 130 km

Suppose that after X hours, the distance between the two vehicles is 130 km. There are two situations: one is that the two vehicles drive face-to-face 52X + 78x + 130 = 650 x = 4 (hours); the other is that the two vehicles drive in the same direction, and both of them drive in the direction of B --- > A. because the cars from B are faster, the distance between them and the slow cars from a can be continuously shortened

The distance between a and B is 600 km. A passenger car and a freight car drive from a to B at the same time. The passenger car arrives 4 hours earlier than the freight car. When the passenger car arrives at B, the freight car runs 400 km. How many km does it take to complete the whole journey?

Truck speed (600-400) △ 4 = 50 km / h
The bus arrived four hours earlier than the truck, and the truck was still 400 km away when the bus arrived. The remaining 200 km of the truck took four hours, so the speed of the truck was 200 △ 4 = 50 km / h,
It takes 600 △ 50 = 12 hours to complete the whole journey
If the bus arrives 4 hours earlier than the truck, the bus takes 12-4 = 8 hours

The distance between a and B is 600 km. The bus runs from place a to place B at the speed of 60 km / h, and the train runs from place B to place a at the speed of 50 km / h. The bus leaves at 8 am. In order to make the two cars meet at the midpoint, the truck must leave in the morning______ Let's start at the right point

It takes 6 (hours) for trucks to reach the midpoint; it takes 5 (hours) for buses to reach the midpoint; it takes 6-5 = 1 (hours) for trucks to reach the midpoint; it takes 8-1 = 7 (hours) for trucks to start; a: trucks must start at 7 a.m

There is a distance of 600 meters between a and B. a train of passenger cars and freight cars run from a to B at the same time. The passenger cars arrive 4 hours earlier than the freight cars. When the passenger cars arrive at B, the freight cars go
400 km. How many hours did it take for the bus to complete the whole journey? What about the truck?
It's 600 kilometers away

The bus arrives 4 hours earlier than the truck, and the truck is still 400 km away when the bus arrives. The remaining 200 km of the truck takes 4 hours, so the speed of the truck is 200 / 4 = 50 km / h, and the time for the truck to complete the whole journey is 600 / 50 = 12 hours. When the bus arrives 4 hours earlier than the truck, the bus takes 12-4 = 8 hours

The distance between a and B is 600 km. A passenger car and a freight car drive from a to B at the same time. The passenger car arrives 2 hours earlier than the freight car. When the passenger car arrives at B, the freight car runs 440 km. How many hours does it take for the passenger car to complete the whole journey?

Suppose the speed of passenger car v1. The whole journey takes time t, then the speed of freight car V2 and the time T-2
So there is: v1t = 600
v2(t+2)=600
v2t=440
T = 5,5 hours
At the same time, the speed of the second car V1 = 109 km / h V2 = 80 km / h can be calculated

The distance between a and B is 900 km. A bus and a truck are going from a to B at the same time. The bus arrives 5 hours earlier. When the bus arrives at B, the truck runs 600 km. What is the speed of the bus per hour?

(900-600) △ 5 = 300 △ 5 = 60 (km / h); 900 △ 60-5 = 15-5 = 10 (H); 900 △ 10 = 90 (km / h); a: the speed of the bus is 90 km / h

The distance between a and B is 600 kilometers. A passenger train and a freight train are going from a to B at the same time. The passenger train arrives 2.5 kilometers earlier than the freight train
The distance between a and B is 600 km. A passenger train and a freight train are driving from a to B at the same time. The passenger train arrives 2.5 hours earlier than the freight train. When the passenger train arrives at B, the freight train runs 4 / 5 of the whole journey. Q: how long does it take for a truck to travel the whole journey?

2.5 * 5 = 12.5 hours, the bus arrives 2.5 hours earlier than the train, and at this time, the truck still has 1 / 5 of the distance, that is to say, 1 / 5 of the distance is 2.5 hours, so the total is 2.5 * 5, that is 12.5 hours