How fast do tsunami waves travel across the open ocean?

about 100 km/h
about 250 km/h
up to 500 km/h
up to 800 km/h
Where the ocean is over 6,000 meters (3.7 miles) deep, unnoticed tsunami waves can travel at the speed of a commercial jet plane, over 800 km per hour (500 miles per hour). Tsunamis travel much slower in shallower coastal waters where their wave heights begin to increase dramatically.
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Answers by country

about 100 km/h
about 250 km/h
up to 500 km/h
up to 800 km/h
answers
flagPoland
4%
33%
29%
33%
268
flagthe United Kingdom
0%
20%
50%
30%
10