Why longer Ramadan fast for Burj Khalifa residents?

Recently, the Burj Khalifa residents have been suggested to observe varied timings for iftar, sunset and dawn prayers depending on the level where live becase, the greater the distance from the ground, the longer the duration of the fasting, given the fact that people on top of the tower witness the sunrise early and the sunset later than those on the ground floor. So, while people living between floors 80 and 150 in the 826-metre tower, would have to delay their evening iftar meal by two minutes, those on the 151-160 floors have to delay breaking their fast by three minutes.