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2015-08-28T16:32:35+08:00

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Distance divided by the Average Speed is the formula for this problem but since x is not given and you are asking for a expression, the expression will be Distance / Average Speed.
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Yes, but how would you find x?
You are asking for an expression ?
Oh, and it's 873 kilometers.
Yes.
It is impossible to find the value of x if it's average speed is not given.
2015-08-28T18:22:41+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
If 1 km/hr = 1000 m/hr, then x km/hr = 1000x m/hr.
d = 873m        s = 1000x m/hr
t = d/s
  = ( 873m ) / ( 1000x m/hr )
  = ( 873 ) / ( 1000x hr )  ( cancel "m" )
t = 873/1000x hr
Therefore, he traveled 873/1000x hrs.
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