On the map with a scale of 1:2000000, the distance between a and B is 18.4cm. The passenger car and the freight car start from a and B at the same time and meet each other in 4 hours. The speed of the passenger car is known to be 40km / h, so the speed of the freight car can be calculated

On the map with a scale of 1:2000000, the distance between a and B is 18.4cm. The passenger car and the freight car start from a and B at the same time and meet each other in 4 hours. The speed of the passenger car is known to be 40km / h, so the speed of the freight car can be calculated

18.4 △ 12000000 = 36800000 (CM), 36800000 cm = 368km, 368 △ 4-40 = 52 (km); a: the speed of the truck is 52km

The distance between a and B is 4.2 cm measured on the map with a scale of 1:2000000. If the car starts from a place at 7 am at a speed of 60 km / h, it will arrive at B place at () am

4.2÷1/2000000=8400000（cm）=84（km）
4 hours = 1 hour 24 minutes
7:00+1：24=8:24
Then arrive at place B at 8:00 a.m. (24:00 a.m.)

AB is 450 kilometers away from each other. A and B are running from each other at the same time. They meet in three hours. A's speed is seven eighths of B's
How many kilometers do vehicles a and B travel per hour

450÷3=150
Vehicle B 150 ÷ (1 + 7 / 8) = 80 km / h
Car a 150-80 = 70 km / h

The speed ratio of passenger cars to freight cars is 7:4. The two cars start from two places at the same time and run in opposite directions. They meet at 36km from the midpoint. How long is the highway between the two places?
The speed ratio of passenger cars to freight cars is 7:4. The two cars start from two places at the same time and run in opposite directions. They meet at 36km away from the midpoint. How many kilometers is the highway between the two places?

144