A train of length 360 metres crosses an electric pole in 30 seconds and crosses another train of the same length travelling in opposite direction in 15 seconds. What is the speed of the second train?
Answer & explanation
Correct answer: option 1
In first case ,
Total distance = 360 m
Speed of train = \(\frac{Distance }{Time}\)
= \(\frac{360}{30}\) = 12 m/sec
Now ,
In 2 nd case
Total distance = 360 + 360 = 720 m
Let speed of another train = x m/sec
Relative speed = (x + 12) m/sec
(When both the trains moves in opposite direction )
Time taken to cross each other = 15 sec
Relative Speed = \(\frac{720}{15}\) = 48 m/sec
Now , x + 12 = 48 m/sec
x = 36 m/sec
So , speed of second train = 36 m/sec