Two trains travel toward each other on a straight track

PHYSICS · Single correct · CBSE · Physics · Motion in a Plane · Motion in a Plane

Problem

Two trains travel toward each other on a straight track. At a certain instant they are

600\,\text{m}

apart. Train X moves at

15\,\text{m\,s}^{-1}

and train Y at

20\,\text{m\,s}^{-1}

. Approximately how much time elapses before the front ends of the trains meet? (a)

24\,\text{s}

(b)

30\,\text{s}

(c)

17\,\text{s}

(d)

40\,\text{s}