Workmen arrive at a mine workshop to receive tools for maintenance...

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Workmen arrive at a mine workshop to receive tools for maintenance. The inter-arrival time of workmen at the service counter is exponentially distributed with an average time of 10 min. The service time at the counter is also distributed exponentially with a mean time of 6 min. The probability that there is a queue (more than one workman) at the service counter is,

A. 0.24

B. 0.36

C. 0.40

D. 0.60

Answer: Option B

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