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minnie rides on a flat road at kilometers per hour (kph), downhill at kph, and uphill at kph. penny rides on a flat road at kph, downhill at kph, and uphill at kph. minnie goes from town to town , a distance of km all uphill, then from town to town , a distance of km all downhill, and then back to town , a distance of km on the flat. penny goes the other way around using the same route. how many more minutes does it take minnie to complete the -km ride than it takes penny?