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10 October, 15:59

Your mother takes you to your grandparents house for dinner? She drives 60 minutes at a constant speed of 40 miles per hour. She reaches the highway, quickly speeds up, and drives for another30 minutes at a constant speed of 70 miles per hour.

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  1. 10 October, 16:33
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    1 hour time 40 miles / hour = 1*40=40miles

    0.5 * 70=0.5*70=35 miles

    40+35=75 miles

    60 minutes+30 minutes = 90 minutes or 1 1/2hours
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