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Guys is my logic correct? If Earth travels around the Sun in $29.78$ km/s and I have to calculate how long will it take to travel $1$km I did following:
$1s / 29.78 = 0.03358$ (to $5$ d.p)
I think it's ok but I would like to get confirmation on this.
Thank you.

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    Divide the distance taken by the speed, yes. Dimensional analysis is a helpful sort; if the unit of your final result is a proper unit of the quantity you're interested in, your solution is (probably) reasonable.2010-12-03
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    You have the speed in units of km/s (km per second), invert this and you have s/km (seconds per km), exactly what you want.2010-12-03
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    @Derek Jennings could you please show me how to invert this?2010-12-03
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    Inverting a number $x$ is the same as dividing 1 by $x$: $\frac1{x}$ . Treat "km" and "s" as variables like $x$ and $y$ .2010-12-03

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