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

Two ships are 10 km apart on a line running south to north. The one farther north is streaming west at 40 km per hr, the other ship is streaming towards north with the same speed. The time after which the two ships are at closed distance is

A

7.5 min

B

12 min

C

14 min

D

20 min

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The correct Answer is:
A
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