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simple exponential distribution problem.....need help

T

Trs80

Jan 1, 1970
0
problem:
Service time is exponentially distributed with mean 30 minutes.
1st customer arrived at t=0 min.
2nd customer arrives at t=5 min
what is expected duration from arrival of 1st to departure of the 2nd
customer?

Can you help provide some hints on how to solve this?

thank you.
 
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