6. The number of boats arriving at Terreiro do Paco, in Lisboa, since the opening time of the river station follows a Poisson process. It is known that, on average, 10 boats arrive per hour. a) The time, in hours, since the opening time of the river station until the first boat arrives follows the distribution Di) Gamma(2, 1/10) ii) Exp(10) O iii) Exp(5) Div) Gamma (2, 10) b) Compute the probability that 2 boats arrive at Terreiro do Paco in 30 minutes