Help needed ASAP WILL GIVE BRAINLIEST AND 5 STAR RATES

Answer: 3 mph.
Step-by-step explanation: If you follow the graph, it shows that in 1 hour she traveled about 3 miles, and in 2 hours, she traveled about 5 miles, and in 3 hours she traveled about 6 miles, and finally, in 4 hours, she traveled 9 miles.
Hope this helped.