Motion and Time...

In order to measure very short intervals, we mostly use :

What determine the nature of the path followed by the particle 

A scooterist travels at 30 km/h along straight path for 20 min. What is distance?

Speedometer measures the speed of the car in 

A car covers a distance of $$2 \ km$$ in $$2.5$$ minutes. If it covers half of the distance with speed $$40 \ km/hr$$, the rest distance it shall cover with a speed of:

Which of the following physical quantities has same unit in all the three system of units?

Rajdhini express moves at a speed of $$150\ km/h$$. How long will it take to cover a distance of $$15\ km$$?

Which of the following does not express a time interval?

If we denote speed by $$S$$, distance by $$D$$ and time by $$T$$ the relationship these equation is? 

Which one of the following can not be used for measurement of time ?