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?

[A].	10
[B].	12
[C].	15
[D].	20

Answer: Option B

Explanation:

Speed of the first train =		120		m/sec = 12 m/sec.
		10

Speed of the second train =		120		m/sec = 8 m/sec.
		15

Relative speed = (12 + 8) = 20 m/sec.

Required time =		(120 + 120)		sec = 12 sec.
		20

Aptitude :: Problems on Trains : More Exercises

Problems on Trains - General Questions

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?

Aptitude :: Problems on Trains : More Exercises

Questions & Answers

Interviews

Jobs

Results

Admission

Admit Card

Answer Key