Discussion :: Problems on Trains
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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?
Answer : Option B
Explanation :
Speed of the first train = \( (\frac { 120 } { 10} ) m/sec =12m/sec\)
Speed of the second train = \( (\frac { 120 } { 15} ) m/sec = 8m/sec\)
Relative speed = (12 + 8) = 20 m/sec.
Required time= \( \left (\frac {( 120+120) } { 20 } \right) sec = 12 sec\)
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