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Problems on Trains - General Aptitude

Q1:

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

ANS:B - 12

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.
Therefore Required time = [ (120 + 120) ] sec = 12 sec.
20