Question

A car travels at a speed of 15m/s. Determine its speed in kilometer.
(using expansion method)

Answer 1

Answer:-

• Speed of car in m/s=15m/s

Convert it to km/h

$\\ \sf\longmapsto Speed\:of\:Car\:in\:m/s\times \dfrac{5}{18}$

$\\ \sf\longmapsto 15\times \dfrac{5}{18}$

$\\ \sf\longmapsto \dfrac{25}{6}$

$\\ \sf\longmapsto 4.1km/h$

Note:-

$\boxed{\sf Speed=\dfrac{Distance}{Time}}$

• SI unit of speed is m/s.