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'.Solution
ATQ, Given :- 
Total time = (w-10)/5 + w/10 + (w+10)/8 On solving we get, w = 15
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