Solve the Problem $5 \mathrm {~km} / \mathrm { hr }$

Solve the problem.
-Jill is 18 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 1.5 kilometers per hour. They meet in 4 hours. How fast is Joe walking?

A) $5 \mathrm {~km} / \mathrm { hr }$
B) $3 \mathrm {~km} / \mathrm { hr }$
C) $4 \mathrm {~km} / \mathrm { hr }$
D) $1.5 \mathrm {~km} / \mathrm { hr }$

Correct Answer:

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