Hi All,

This questions compares the average speeds of two women, so we have to organize our information in those terms.

Emma runs the 10km run in 4 hours, so her average speed is 10/4 = 2.5 km/hour. We're told that Jess ran at an average speed that was 20% FASTER than Emma's average speed.

(2.5 km/hr)(1.2) = 3 km/hr

Now that we know Jess's speed, we can figure out how long it took her to complete the run:

D = (R)(T)

10km = (3km/hr)(Time)

10/3 hours = Time

Final Answer:

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