Read the following conversation and answer the question.

M: It's about 2300 km by train from Guangzhou to Beijing.

W: Ok, it's about 500 km farther than from Guangzhou to Shanghai.

Question: How many kilometers by train is it from Guangzhou to Shanghai? 

- About 2300 km.

- About 1800 km.

- About 2800 km.


About 1800 km.