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One kilometre is equal to 1000 x 1000 = 1000000 millimetres. Therefore, 180 kilometres per second is equal to 180 x 1000000 = 180000000 millimetres per second.

There are 3600 seconds in one hour. Therefore, 180000000 millimetres per second is equal to 180000000 x 3600 = 648000000000 millimetres per hour.

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Q: How many millimetres per hour is equal to 180 kilometers per second?
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