Distance, speed, time: s = v · t
Find distance, speed and time from a table and from the formulas s = v · t, v = s : t, t = s : v.
- Ukraine: grade 4
- Russia: grade 4
Guide
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.