Question

A person walks a certain distance in three parts. For the first 'w - 10' km, he walks at 5 km/h, for the next 'w' km at 10 km/h, and for the final 'w + 10' km at 8 km/h. If his average speed across the entire distance is 8 km/h, find 'w'.

A 10
B 20
C 15
D 30
E none of these
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