Answer
$F=357.2$ miles per hour
$J=361$ miles per hour
Work Step by Step
F is the speed of the French TGV-
J is the speed of the Japanese Maglev.
$J=F+3.8$
$J+F=718.2$
$F+3.8+F=718.2$
$2F=714.4$
$F=357.2$
$J=357.2+3.8=361$
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