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Two ships are 10 km apart on a line from...

Two ships are 10 km apart on a line from south to North. The one further North is moving towards West at 40 km/hr and other is moving towards North at 40 km/hr. The distance of closest approach is

A

5 km

B

`5sqrt(2)` km

C

10 km

D

`(5)/(sqrt(2))` km

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The correct Answer is:
B
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