Question 395322
remember the relationship distance=rate*time  or d=rt
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going:   80 miles at speed r and time t   80=rt
coming:  80 miles at speed 2r and time t-2  80=2r*(t-2) or 40=r(t-2)=rt-2r
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80=rt and 40=rt-2r
40=80-2r
2r=40
r=20 this is the going speed 20mph