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Mathematics
Problem
A train’s position function satisfies
x
′
(
3
)
=
28
x'(3)=28
x
′
(
3
)
=
28
, where
x
x
x
is measured in kilometers and
t
t
t
in minutes. Explain the practical meaning of the value
x
′
(
3
)
=
28
x'(3)=28
x
′
(
3
)
=
28
in this context, including appropriate units.
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