Book Maths Puzzle Numerical Ability Co-ordinate geometry

the number of lines that are parallel to 2x+6y+7=0 and have an intercept of length 10 between the coordinate axes is
a)0 b)1 c)2 d)infinite
plz solve dis q step by step

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Book Other Question

Two cyclists race on a circular track. Brown can ride once round the track in six minutes, and Robinson in four minutes. In how many minutes will Robinson overtake Brown? 3+5+6=151872
5+5+6=253094
5+6+7=303585
5+5+3=251573
then
9+4+7= ?