Question 348056
dennis's speed be x kph
Jodie's speed = x+7 kph
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Dennis  60 km
Jodie = 81 km
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The times are same
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{{{ time = distance / speed }}}
{{{60/x = 81/(x+7)}}}
60(x+7)=81x
60x+420=81x
81x-60x=420
21x=420
/21
x=420/21
x=20 kph speed of Dennis
x+7 = 20+7 = 27 = Jodie's speed