Gears A and D have 60 teeth each, gear B has 40 teeth, and gear C has 20 teeth.
Suppose that gear B makes twenty complete turns every minute,
explain the relative speed of gears A and D

The speed of the train is two more than twice of the time taken to cover 1012 km at uniform speed.
What is the ratio of the values of time taken to cover the distance and speed of the train?

A car start with a velocity 20 km/hr and after every hour its speed increases by 10 km/hr.
After 8 hour it starts decreasing the speed 10 km/hr after every hour and finally it stops in the destination.
What is the total length of the journey?

A car covers distance 440 km in 8 hours.
A motorbike covers the same distance in 5 hours.
What is the respective ratio between the speed of the car and the motorbike?