SOLUTION: Two trains of length 55 metres and 65 metres travel in opposite directions with speed 70 km/hour and 50 km/hour respectively. Find the time taken for them to completely cross one

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Question 993864: Two trains of length 55 metres and 65 metres travel in opposite directions with speed 70 km/hour and 50 km/hour respectively. Find the time taken for them to completely cross one another.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Two trains of length 55 metres and 65 metres travel in opposite directions with speed 70 km/hour and 50 km/hour respectively.
Find the time taken for them to completely cross one another.
:
The relative speed between the two trains: 70 + 50 = 120 km/hr
Change 120 km/hr to meters/sec
%28120%2A1000%29%2F3600 = 331%2F3 meters per sec
:
Find the no. of seconds to travel 55 + 65 = 120 meters
120%2F33.33 = 3.6 seconds