At a bus stop, the bus inter-arrival times (the time that passes between bus arrivals) are independent and identically distributed with rate 2 per hour. When you arrive at the bus stop, you find out from a witness that the last bus arrived 10 minutes before you arrived. The expected amount of time that you will have to wait for the bus is [5 points] (a) 20 minutes. (b) 1hour 50 minutes. (c) 30 minutes. (d) 2 hours