A child walks \large\frac{7}{24} km towards north and then \large\frac{17}{36} km towards south. How far is the child now from the starting point.

Question

( A ) \large\frac{17}{73}
( B ) \large\frac{13}{72}
( C ) \large\frac{11}{72}
( D ) \large\frac{10}{73}