Tabby is training for a triathlon. She swims at a speed of 1 mile per hour. She runs at a speed of 6 miles per hour. She wants to figure out her average speed for these two events. What is the correct answer for her?
Choose the correct choice from the following answers
A) 8 mph B) 5.25 mph C) 3.5 mph D) 4 mph E) 0.5 mph

Rationale: "( 1 mph + 6 mph ) / 2 = 3.5 mph correct option is : c"
Answer: C