A cell center can process (i.e. deliver within 10 seconds) up to 1800 text messages per minute. If actual average text traffic is 28 messages per second, what is the probability that in a given second, 1 of every 20 text messages will be delayed (i.e. not delivered in 10 sec)?

Could someone pls help me out on this question? If okay, kindly display solution.

Thanks and g00d day! : )