An algebra problem by Anshul Sanghi
Algebra
Level
pending
2 trains are running in opposite directions of length 60 m and 40 m with the velocity 36km/hr N and 54km/hr S respectively . air is moving in north direction with velocity 3m/s. Find the time taken (in seconds) for the trains to pass each other completely.
2
8
4
6
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1 solution
distance need to be travelled = sum of both the trains =40 + 60 = 100m speed of first train =36 km/hr=36 5/18=10m/s speed of second train = 54km/hr =54 5/18=15m/s so distance travelled by both trains in 1 second = 15 + 10 = 25m time taken = 100/25 = 4 seconds *The velocity of air does not effect as it opposes one motion and supports one motion equally.