Two cars, at a certain instant, are 
apart on a line running from south to north. The one farther north is moving west at 
. The other is moving towards north at 
. How long do they take to reach their distance of closest approach?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let us sit on 
and observe ' 
'.
From diagram, we can clearly see when A reaches point ' 
its distance is closest from 
.
So, 
Then, 
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