A train X speeding with 120 kmph crosses another train Y, running in the same direction, in 2 minutes. If the lengths of trains X and Y be 100m and 200m respectively, what is speed of train Y(in kmph)?
a. 111
b. 123
c. 127
d. 129
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s1 -s2 = x+y/t
120-s2 = 100+200/ 2×60
120-s2 =300/120
120-s2 = 5/2
120-s2 = 5/2 × 18/5
120-s2 =9
s2 = 120-9
s2 =111 kmph is answer
option a is answer obtained
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