book Maths Puzzle Numerical Ability

x 2x+3
--- = -------
4 15

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Qus-
while covering a diatance of 24 km, a man was noticed that after walking 1h and 40 minutes, the distance covered by him was 5/7 of the remaining distance. What was his speed in meters per seconds. i do not understand polynomials AT ALL so any help would greatly be appreciated
(2x squared +3x - 5)+ (7x squared -x+7)=
i tried it and this is what i got for the answer
9xsquar