Question

Given below are four sentences, which are jumbled. Pick the option that gives the correct order.

P - Raju was deeply affected by a rail accident near his village in his childhood.

Q - He has successfully demonstrated this method in educational institutions and other places.

R - Using models of trains, he worked out a method of stopping them automatically.

S - He has been trying to develop a system to control the speed of the train coming from the opposite direction