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20 May, 15:57

Brantley and Shawna walk to Grandma's house at a rate of 4 mi/hr. They ride their bicycles back at 8mi/hr over the same route that they walked. It takes 1 hr longer to walk than to ride. How long did it take them to walk to Grandma's?

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  1. 20 May, 18:58
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    Let the distance be x,

    x:4 = (*:8) + 1 ... multiply both sides by 4

    x = 0.5x+4

    0.5x=4

    x=8

    Time taken to walk=8:4=2hours
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