8. A microcontroller can execute only one command at a time. Two commands are received 6 microseconds apart. The execution time for the first command is independent of the second and can be modeled as an exponential random variable with a mean of 5 microseconds. The execution of the second command can similarly be modeled as an exponential random variable with a mean of 10 microseconds. What is the expected time from the start of execution of the first command to the completion of the second command?