During the first two hours of a 4-h trip, the force of the wind causes a sailboat to travel 68 km. During the next two hours, the wind speed changes. The boat sails 3 km in the next hour and 25 km in the last hour. What was the boat’s AVERAGE speed?
We figure out the total distance traveled, which is 68+3+25= 96, and divide by 4 hours. 96/4 = 24 km/hour.
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