Fifty-three feet. Right. Matilda grabs the ruler out of her backpack.

An apologetic glance is cast Charlie's way. This will be much easier to do with telekinesis.

Roughly thirty seconds later, the ruler has leapfrogged exactly fifty-three feet down the road, each jump marked by a small pebble or loose chunk of asphalt, and Tilda is carefully lined up at the beginning of this waiting for Charlie to start with the timing.