Two trains of equal length take 10 sec and 15 sec respectively to cro…

Question

Two trains of equal length take 10 sec and 15 sec respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction ?

Accepted Answer

Option C. 12 sec. Answer & Solution Answer: Option C Solution: & S_1 = 12010 m/sec & \,\,\,\,\,\,\,\, = 12 m/sec & S_2 = 12015 m/sec & \,\,\,\,\,\,\,\, = 8 m/sec Time taken to cross each other : & = l_1 + l_2 V_ rel . & = 24020 & = 12