Solve the Problem $2 \frac { 1 } { 2 }$

Multiple Choice

Solve the problem.

-On her way to a holiday weekend, Nancy drove $2 \frac { 1 } { 2 }$ hours in rush-hour traffic. When traffic eased up, she was able to increase her speed by 42 miles per hour and drove another $4 \frac { 1 } { 2 }$ hours. If the entire trip was 343 miles, how fast did she drive in rush-hour traffic?

A) 23 mph
B) 24 mph
C) $23 \frac { 1 } { 2 }$ mph
D) 22 mph