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In a race from point X to point Y and back, Jack averages 30 miles per hour to point Y and 10 miles per hour b

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In a race from point X to point Y and back, Jack averages 30 miles per hour to point Y and 10 miles per hour b

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  1. wel whats the question?


  2. let distXY=d=dist YX..then t1=d/30hr..and t2=d/10

    total dist = 2d...tot time= d/30+d/10=4d/30 hr

    > ave speed=2d/(4d/30)=2x30/4=15mph.
You're reading: In a race from point X to point Y and back, Jack averages 30 miles per hour to point Y and 10 miles per hour b

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