Respuesta :

irspow

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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