1.

A boy goes to the market at a speed of 10 kmh"1 and returns at a speed of 5 kmh1 . If he takes 3 hours in all, what is the distance between his home and the market ?

Answer»

10 km



Let the distance = X 
TIME taken = (x/10 + x/5) hr
x/10 + x/5 = 3.



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