If you were trying to simplify it, it's not posible because 23 is a composite number so I just went ahead and did division for you: 23/46=0.5 I hope this helped!
Since the function d=45t can have numbers in between and time is constantly happening, he does not hop, or skip at 1 second, then 5 seconds...he is continuously traveling, so time = 1 sec, 1.1 sec., 1.1000001, 1.000002, etc. time does not stop therefore if you graphed this, you would connect the dots, therefore, it is continuous