Observe the given pictures and identify the types of motion. Give one more example for each to justify your answer.

 

An object travels $20$ meters in $4$ seconds and $15$ meters in the next two seconds. What is the average speed of the object?

Find the speed of the bike in m/sec which covers a distance of $4\times {10}^4$ m in ${10}^{-2}$ seconds.

The distance between two stations, $\mathrm{A}$ and $\mathrm{B}$,is $575 \mathrm{km}$. A train starts from station $\text{'}\mathrm{A}\text{'}$at $3:00 \mathrm{p}.\mathrm{m}.$and moves towards station $\text{'}\mathrm{B}\text{'}$ at an average speed of $50 \mathrm{km}/\mathrm{hr}$.Another train starts from station $\text{'}\mathrm{B}\text{'}$at $3:30 \mathrm{p}.\mathrm{m}.$and moves towards station $\text{'}\mathrm{A}\text{'}$ at an average speed of $60 \mathrm{km}/\mathrm{hr}$.How far from station $\text{'}\mathrm{A}\text{'}$ will the trains meet?

Two trains 152.5 m and 157.5m long, running in opposite directions, cross each other in 9.3 seconds. What will be the combined speed of both trains per hour?