Problem
4
:
A
person
that
walks
at
15
km
/
h
can
travel
a
distance
in
twenty
minutes
.
At
what
speed
does
another
person
walk
if
he
travels
the
same
distance
in
thirty
minutes
?
Data
:
km
/
h
-
-
-
minutes
km
/
h
-
-
-
-
-
minutes
It
is
an
proportion
Operation
:
·
:
=
Solution
:
The
other
person
walks
at
/
h