A runner wants to run 129 km She knows that her running pac

A runner wants to run 12.9 km . She knows that her running pace is 6.5 mi/h . How many minutes must she run? Hint: Use 6.5 mi/h as a conversion factor between distance and time. Express your answer using two significant figures.

Solution

Distance = 12.9km

Speed = 6.5mi/h = 6.5*0.0268km/min = 0.174km/min

Speed = Distance/Time

Time = Distance/Speed = 12.9km/0.174km/min = 74.05min

Time = 74.05min