Mathematics · Practical Arithmetic

A staircase room of dimensions 5.2 m × 2 m connects the Ground floor (+0.0 m level) with the First floor (+3.0 m level). The steps have a rise of 15 cm and a tread of 30 cm, with an equal number of steps provided in both flights and a landing of 1.2 m width in between. What is the remaining horizontal clear distance available at the Ground floor before the start of the first flight?