On a map with a scale of 1:30000000, the distance between the two cities is 7cm. If you draw on a map with a scale of 1:5000000, what is the distance between the two cities? No, please go away

On a map with a scale of 1:30000000, the distance between the two cities is 7cm. If you draw on a map with a scale of 1:5000000, what is the distance between the two cities? No, please go away

Let X be the actual distance between Party A and Party B on the map of scale 1:30000000, y be the distance between Party A and Party B on the map of scale 1:5000000, 1:3000000 = 7: x = 7 * 3000000 = 210 (km), 1:5000000 = Y: 21000000, y = 21000000 divided by 5000000 = 4.2cm, to give a satisfactory affirmation

On a map with scale of 1:5000000, the distance between city a and city B is 8cm, and the actual distance between city a and city B is calculated
P50 question 2 above

Because the distance on the map: actual distance = 1:5000000, so 8cm: actual distance = 1:5000000, so the actual distance = 8cm × 5000000 = 40000000cm = 400km

On a 1:5 million map, the distance between Shanghai and Hangzhou is 3 cm,
On the map of 1:5000000 scale, the distance between Shanghai and Hangzhou is 3cm. When does a car leave Shanghai at the speed of 60km in the morning and arrive in Hangzhou?

3 / (1 / 5000000) = 1500000cm = 150km
The time taken by car from Shanghai to Hangzhou is 150 / 60 = 2.5 hours
So the time to Hangzhou is 8 + 2.5 = 10.5

On one map with a scale of 1:5000000, the distance between a and B is 5cm. On another map with a scale of 1:2500000, the distance between a and B is 5cm,
How many centimeters is the distance between the two places?

5÷1：5000000=25000000cm
25000000×1：2500000=10cm
The distance between the two places is 10 cm. '
This is the first answer. I wish you progress!