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If you are traveling 1.5 km in 30 seconds, you are traveling 3 km per minute or 180 km per hour. The 30 seconds is half a minute, as you know, and if you travel 1.5 km during that time, you can travel twice that far in twice the time (30 sec. x 2 = 60 sec. = 1 minute), so you'll be going 3 km per minute. There are 60 minutes in an hour, so 60 times 3 km per minute equals 180 km per hour.
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