Kenneth ran a marathon (26.2 miles) in 5.5 hours. What was Kenneth's average speed? (Round your answer to the nearest tenth.) a) 0.2 mphb) 4.8 mphc) 5.5 mphd) 144.1 mph

b) 4.8 mph

Explanation:

Average speed:Speed is the rate of change of distance with time. Speed is a scalar quantity because it can be represented by magnitude only. The S. I unit of speed is m/s.

The mathematical formula for speed is given below

S = d/t ... Equation 1

Where S = speed, d = distance and t = time.

Given:

d = 26.2 miles, t = 5.5 hours.

substituting these values into equation 1,

S = 26.2/5.5

S = 4.763 mph

To the nearest tenth,

S = 4.8 mph

Thus Kenneth's average speed is 4.8 mph

The right option is b) 4.8 mph