simple exponential distribution problem.....need help

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.
Reply to
Trs80
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Why not ask your teacher?
Reply to
John Nice
Joint probability.
Bill
Reply to
Salmon Egg

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