Two trains of equal lengths take 10 seconds and 15 seconds respective…

Question

Two trains of equal lengths take 10 seconds and 15 seconds 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 d…

Accepted Answer

Option B. 12. Answer & Solution Answer: Option B Solution: & Speed\, of\, the\, first\, train & = 12010 \, m/sec & = 12\, m/sec & Speed\, of\, the\, second\, train & 12015 \, m/sec & = 8\, m/sec & Relative\, speed = 12 + 8 = 20\, m/sec & Required\, time & = 120 + 120 20 \, sec & = 12\, sec

Two trains of equal lengths take 10 seconds and 15 seconds 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?

Solution