if drivers wanting to fill up their cars arrive randomly at another gas station across the street at a rate of 45 custom

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if drivers wanting to fill up their cars arrive randomly at
another gas station across the street at a rate of 45 customers per
hour. On average the service time is 3 minutes to pump has and pay,
and varies exponentially. One of the 5 pumps malfunctions. The cars
will drive to each pump to fill up the gas. If the pump is used,
they will wait in line at each pump. In this case, if we use the
hour as a measurement when we use M/M/s model to solve this problem
what are the mean arrival rate, mean service rate, and number of
servers?