Question

Convert - 90 km/h into m/sec

And 15m/sec into km/hr.

Answer 1

$$\begin{gathered} \left(\mathrm{a}\right). \\ 90\mathrm{km}/\mathrm{hr} \\ =\frac{90\times 1000}{3600}\mathrm{m}/\mathrm{s} \\ =25\mathrm{m}/\mathrm{s} \\ \left(\mathrm{b}\right). \\ 15\mathrm{m}/\mathrm{s} \\ =\frac{15\times 3600}{1000}\mathrm{km}/\mathrm{hr} \\ =54\mathrm{km}/\mathrm{hr} \end{gathered}$$