Two men start together to walk to a city garden, one at 3.75 km an hour and another at 3 km an hour. The former arrives half an hour before the later. What is the distance?
A. 7 km
B. 2 km
C. 3 km
D. 7.5 km
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Let the distance be D.
Time taken by first person = D/3.75
Time taken by second person = D/3
According to the problem,
D/3 - D/3.75 = 0.5
0.75D/11.25 = 0.5
D = 0.5*11.25/0.75 = 7.5 km