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7 and a half minutes.
That is a bit long. It is 7000 meters. It is a one and a half hour walk.
Half an hour down stream one and a half hours upstream if the water is running at about 1 mile an hour.
1.5 hours is equal to one and a half hours or 90 minutes.
One hour is 60 minutes so one and a half hour is 60 + 30=90 minutes