81+ 670616629 Miles Per Hour. It is equal to exactly 1.609344 kilometers per hour. English secondary school answered 670616629 miles per hour advertisement sujithakkun is waiting for your help. In miles per hour, light speed is, well, a lot about 670,616,629 mph from www.pinterest.com Light travels at a constant speed of 1,079,252,848.8 (1.07 billion) km …