served?

$\frac{1}{3}$

$\frac{1}{4}$

$\frac{1}{5}$

$1/6$

$\frac{4}{27}$

frofessor Chambers gets a side Job as a photographer works a 3 hour shift. He has noticed that 4 clients arrive per shift and the them is exponentialbf distributed It him 30 rrunutes to handle each djent but this time Is also exponentfany dstributed. What is the probability that ProfessorChamhers serving customer and to be 0 4/27 Question 9