Disappointed about the cancelling of the Rocton World's Fair, Grace and Evelyn have decided to go on a 30km walk around the school's catchment area to let everyone know. Grace, the for better walker, walks 1.4 km/hr faster than Evelyn, but sees a friend and stops to talk (at distance) for 20 minutes. Even with this delay Grace finishes the walk 2 hours ahead of Evelyn. How long did each person take to finish the walk?

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