Solve
-Jim Can Run 5 Miles Per Hour on Level $15 \mathrm { mph }$

Multiple Choice

Solve.
-Jim can run 5 miles per hour on level ground on a still day. One windy day, he runs 10 miles with the wind, and in the same amount of time runs 5 miles against the wind. What is the rate of the wind?

A) $15 \mathrm { mph }$
B) $1 \frac { 2 } { 3 } \mathrm { mph }$
C) $5 \mathrm { mph }$
D) $2 \frac { 1 } { 2 } \mathrm { mph }$