In the simulator it worked correctly.
I tested with the value 57 and then changed the division by 500 to make it easier to see.
distance = duration / 57.0;
distance = duration / 500.0;
In the simulator it worked correctly.
I tested with the value 57 and then changed the division by 500 to make it easier to see.
distance = duration / 57.0;
distance = duration / 500.0;