Dan, Dominic, and Doug are waiting together in the living room for their girlfriends, Sally. Shellie, and Susanne, to call their waiting times (in hours)

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Dan, Dominic, and Doug are waiting together in the living room for their girlfriends, Sally. Shellie, and Susanne, to call their waiting times (in hours) are independent Exponential random variables, with parameters 2.1, 3.7, and 5.5, respectively. What is the probability that the phone will ring (i.e., the first call will arrive) within the next 30 minutes (i.e., within the next 1/2 an hour)?

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