distance between Shizuoka and Hamamatsu by v-t graph

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【Question】

When I came home from Tokyo by Shinkansen I got teh data of the speed meter by 10 seconds from Shizuoka to Hamamatsu.
I got the following V-t graph.
How we can get the distannce between the stations?
Can you guess the distance?

distance between Shizuoka and Hmamatsu

reason

discussion

From the data of JR Tokai we understand the distance as follows （　　　　　）㎞. Could you expect good ?

from Tokyo	distance to every station
Shin-Yokohama	25.5 km
Odawara	76.7
Atami	95.4
MIshima	111.3
Shizuoka	167.4
Hmamatsu	238.9
Toyohashi	274.2
Nagoya	342.0
Gifuhashima	367.1
Maibara	408.2
Kyoto	475.3
Shin-Osaka	515.4
Okayama	676.3

Reference: A distance for business are differennt form the real distance. The case about payment for passenger fare.(1975/03/10) to Supreme Court cf.Wikipedia