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A thief, after committing a theft runs a...

A thief, after committing a theft runs at a uniform speed of 50m / minute. After `2` minutes, a policeman runs to catch him.He goes `60m` in first minute and increases his speed by 5m / minute every suceeding minute.After how many minutes,the policeman will catch the thief?

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The correct Answer is:
Policeman will catch the thief in 5 minutes
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