I will be arriving at Washington IAD (Dulles) at 15:30 from Doha. I have to catch my next flight to Orlando (United Airways) which departs at 17:30. Given that Qatar airways lands on concourse B and United leaves from Concourse C Will I be able to make it in 2 hours. I will have one checked bag and will have to go through US citizen immigration. Please advise as this is the last flight from IAD to MCO.