Trip back took "six kilometers per hour"?
?
SPEED TIME DISTANCE
OUTBOUND r 3 d
RETRURNING 6 4 d
The return-trip information tells you the one-way trip distance is , in kilometers. Does this really make sense to you?
If you want to continue working with that, then the outbound trip information means ,
, the outbound trip speed.
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Suggestion: recheck the problem description, since some information may be wrong in your posted question.
NOTE: Distance between those two locations should be much nearer to 738 kilometers.