Satpal walks ^{2}/_{3} km from a place P, towards east and then from there 1^{5}/_{7} km towards west. Where will he be now from P?

Since $1\frac{5}{7}>\frac{2}{3}$, Ahmed's final location will be to the West of his initial position.

Distance between initial and final positions = $1\frac{5}{7}-\frac{2}{3}=\frac{12}{7}-\frac{2}{3}=\frac{36-14}{21}\mathrm{km}=\frac{22}{21}\mathrm{km}=1\frac{1}{21}\mathrm{km}$

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