Question:I have to be at a certain place at a certain time and find that I shall be 20 minutes too late if I walk at 3 km/hr and 10 minutes too soon if I walk at 4 km/hr. How far I have to walk ? 

A 6 km 
B 10 km 
C `12 1/2` km 
D `16 2/3` km 

+ Answer
A 

+ Explanation
Let the distance be x km

`x/3 - x/4 = 30/60 => x/12`

`= 1/2 => x = 6 km`

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Irin Moni

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