Two men of mass 60 kg and 80 kg stand on a plank of mass 20 kg as shown in the figure. Both of them can jump with a velocity of 1 m/s relative to the plank. In each event shown in column-I, find the velocity of plank after the event. 

	Column I		Column II
A	Ram alone jumps to the left	p	$\text{-}\frac{\text{17}}{\text{40}}\text{m/s}$
B	Shyam alone jumps to the right	q	$\text{-}\frac{\text{1}}{2}\text{m/s}$
C	Ram jumps to left and shyam jumps to right simultaneously	r	$\text{-}\frac{3}{8}\text{m/s}$
D	Ram jumps to left and after that shyam  jumps to right	s	$\text{-}\frac{1}{8}\text{m/s}$
		t	0