To cover a distance of 216 km in 3.2 hours, what should be the average speed of the car in metre/ second?

Required speed of car $=\frac{\text { Distance }}{\text { Time }}$

$=\left(\frac{216}{3.2}\right) \mathrm{kmph}$

$=\left(\frac{216}{3.2} \times \frac{5}{18}\right) \mathrm{m} . / \mathrm{sec} .$

$=18.75 \mathrm{~m} . / \mathrm{sec} .$