If a motor car covers a distance of 250 m in 25 second,

If a motor car covers a distance of 250 m in 25 second, What is its speed in kilometer per hour ?

Speed of the motor car in meter per second = 250 / 25
= 10 m/s

Speed in km/hr = (18/5) x speed in m/s
= 10 x (18 / 5) km/hour
=36 km/hour.