Question:Two men start together to walk a certain distance at 3.75 km and 3 km per hour respectively. The former arrives 30 minutes before the later. The distance they walked is : 

A 7.5 km 
B 10 km 
C 12.5 km 
D 15  km 

+ Answer
A 

+ Explanation
Suppose they walked x km.Then,

`x/3 - x/(3.75)`

`= 30/60 => (0.75  x)/(3 xx 3.75)`

`= 1/2`

`:. x = (3 xx 3.75)/(1.5)`

`= 7.5 km`

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Irin Moni

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