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18,000 meters per hour or 18 km/h .

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It is more usual, scientifically, to express speed in metres per second (m/s, or ms-1) as these are the SI units for distance and time, respectively. It also makes the maths a heck of a lot easier to work out, as you don't need to convert seconds to hours!

100 m in 20 s is the same as 5 m in 1 s (100 / 20 = 5). So the answer is also 5 ms-1

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