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 = | ![]() | 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.
![]() | ![]() | (120 + 120) | ![]() | sec = 12 sec. |
20 |
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