According to this paper ( <a href="https:&#x2F;&#x2F;dcc.ligo.org&#x2F;LIGO-P150914&#x2F;public" rel="nofollow">https:&#x2F;&#x2F;dcc.ligo.org&#x2F;LIGO-P150914&#x2F;public</a> ) they detected the signal first at Livingston, Louisiana and 6.9ms later in Hanford, Washington. The distance between them according to wikipedia ( <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;LIGO" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;LIGO</a> ) is 3002km (Ok, the 3002 km distance is on the Earth). If the gravity wave travel at the speed of light they should detect 10ms later (300 000&#x2F;3002 sec = 1&#x2F;100 sec = 10ms ). From these data the gravity travels at 434 000km&#x2F;sec instead of 300 000km&#x2F;sec. Almost 50% faster then light... Is there any error in my calc?