Question 908543
Direct Variation type of problem.

No other information to think otherwise.


{{{5*litersperhour=k*50*kilometersperhour?}}}
This is in the form {{{R=k*r}}}
Using R for the consumption rate
r as the speed of the car
k proportionality constant.


{{{k=5/50}}}
{{{highlight_green(k=1/10)}}}


5*(liters/hour)*(1/50)(hours/kilometer), is probably not the kind of situation involved here.  Why, is that the consumption rate DEPENDS on the speed.  I have assumed that consumption rate will increase with speed and is directly proportional to it.


The relationship you want then is {{{highlight(R=(1/10)r)}}}.


The time values given in your question need to be adjusted for "per hour".