A train is travelling at 48 kmph. It crosses another train having half of its length, travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in
45 seconds. What is the length of the platform?  Choose the most appropriate option:
A) 400 m
B) 500 m
C) 600 m
D) 550 m
E) 700 m
speed of I train = 48kmph   length of I train = 2x m   speed of sec train = 42 kmph   length of seconf train = x m   dist = (2x+x) = 3x m   time = 12 sec   = 90 * 5/18= 
<gadget id="calculator">90 * 5/18</gadget>
<output>25</output>
25m/s   x=100   length of first train = 2x = 200 m   time taken = 45 sec   speed of first train = 48 kmph = 48 * 5/18 = 40/3 m/s   length of the platform = y metre   200 + y = 45 * 45/3 = 600   y = 400   400 mNSWER 400 m
<result>A</result>
A train is travelling at 48 kmph. It crosses another train having half of its length, travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in
45 seconds. What is the length of the platform?