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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There are 100000 millimetres in one kilometre. Therefore, 750000 millimetres per second is equal to 750000/1000000 = 0.75 kilometres per second. There are 3600 seconds in one hour. Therefore, 0.75 kilometres per second is equal to 0.75 x 3600 = 2700 kilometres per hour.
63 miles per second = 365,000 kilometers per hour.
There are 3600 seconds in one hour. Therefore, something travelling at 15000 millimetres per second is travelling at 15000 x 3600 = 54000000 millimetres per hour. There are 25.4 millimetres in one inch. Therefore, rounded to two decimal places, 54000000 millimetres per hour is equal to 54000000/25.4 = 2125984.25 inches per hour.
50 km/h is about 1,388.9 centimeters per second.
About 90 Kilometers.