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Sagot :
Answer:
Step-by-step explanation:
d=vt, t=d/v, we are told they run for same amount of time so t=t and d2/v2=d1/v1
2/v=4/(v+4)
2v+8=4v
-2v+8=0
-2v=-8
v=4
So John jogs at 4 mi/hr
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