⁦Distance, speed, time⁩: ⁦s = v · t⁩

⁦Ukrainian Grade 4 (part 1, word problems with quantities) teaches three motion quantities⁩: ⁦speed v, time t and distance s⁩. ⁦Speed is the distance covered in one unit of time, for example 1 hour (km/h) or 1 second (m/s)⁩.

⁦The formulas are s = v · t, v = s : t, t = s : v⁩. ⁦At a steady speed, 2 hours give twice the distance of 1 hour, 3 hours give three times⁩.

⁦It helps to write the story in a table of time and distance⁩. ⁦The row⁩ "⁦1 h, v km⁩" ⁦shows the speed⁩. ⁦The book also has letter problems⁩: "⁦Pavlo ran x m in 7 min⁩. ⁦What was his speed⁩?" ⁦The answer is an expression⁩.