Question

Garret is in the middle of a 20 minute bike ride. It takes 4 minutes for him to go a kilometer, so he'll end up going 5 kilometers. Suppose k is the number of kilometers Garret has already biked.

Which expressions match below?

Expressions:
5(4−k)
5−k
20−4k
4(5-k)
4k

Answer 1

Is there anymore to the question?

Answer 2

@starwarsfan123 your question seems incomplete.What do you want to compute an expression for?

Answer 3

if I were to ignore the first paragraph entirely then I would say that the expressions that match are `5-k` and `20-4k = 4(5-k)`. evidently because the latter is a multiple of the former.

if however, you are trying to find an expression for how much longer he needs to travel then I would say that
\[speed=\frac{ distance }{ time }\]
speed is `1/4`, the distance covered up until this point is `5-k` and let the time remaining be called `t`
in that case, just plug all the values in and you'll get
\[\frac{ 1 }{ 4 } = \frac{ 5-k }{t }\]
rearrang it and you'll get
\[4(5-k)=t\]