Two stones are thrown up simultaneously from the edge of a cliff \(240~\text{m}\) high with an initial speed of \(10~\text{m/s}\) and \(40~\text{m/s}\) respectively. Which of the following graph best represents the time variation of the relative position of the second stone with respect to the first?
(Assume stones do not rebound after hitting the ground and neglect air resistance, take
\(g= 10~\text{m/s}^2\)${\mathrm{}}^{}$)
(The figures are schematic and not drawn to scale)

1.		2.
3.		4.

Train \(\mathrm{A}\) and Train \(\mathrm{B}\) are running on parallel tracks in opposite directions with speeds of \(36~\text{km/h}\) and \(72~\text{km/h},\) respectively. A person is walking inside Train \(\mathrm{A}\) in the direction opposite to the train's motion with a speed of \(1.8~\text{km/h} .\) What is the speed of this person as observed from Train \(\mathrm{B}\)? (Assume the distance between the tracks is negligible.)