simple exponential distribution problem.....need help

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
Can you help provide some hints on how to solve this?
thank you.
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Why not ask your teacher?
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John Nice
Joint probability.
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Salmon Egg

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