I hate working out, so I prefer to stroll leisurely to get my exercise. I stroll along at 2 km/h. One of my jogging friends told me that I would save time if I jogged even though I covered the same distance of 12 kilometers. He suggested I jog along with his next time he went. Now he can cover ground three times as fast as I stroll, so exactly how much time would I save if I jogged?

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4 hours.
12km / 2 km/h = 6 hours
12km / 6 km/h = 2 hours

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