https://foxoyo.com/mcq/21070/customers-arrive-at-a-ticket-counter-at-a-rate-of-50-per-hr-and-tickets-are-issued-in-the-order-of-their-arrival-the-average-time-taken-for-issuing-a-ticket-is-1-min-assuming-that-customer-arrivals-form-a-poisson-process-and-service-times-are-exponentially-distributed-the-average-waiting-time-in-queue-in-min-is