SOLUTION: A boy riding a bicycle travels at ten miles per hour for three hours. He stops to rest for one hour and then continues his ride. For the next hour he rides at a speed of twenty mil

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Question 513272: A boy riding a bicycle travels at ten miles per hour for three hours. He stops to rest for one hour and then continues his ride. For the next hour he rides at a speed of twenty miles per hour. During this ride, what was the rider's average speed for the five hour period?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Average speed is ( total distance ) / ( total time )
During the 1st 3 hrs:
+d+=+10%2A3+
+d+=+30+ mi
During the last hour:
+d+=+20%2A1+
+d+=+20+ mi
Average speed =
+%28+30+%2B+20+%29+%2F+%28+3+%2B+1+%2B+1+%29+
+50+%2F+5+=+10+
10 mi/hr