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  1. A train, 150m long, passes a pole in 15 seconds and another train of the same length travelling in the opposite direction in 12 seconds. The speed of the second train is
    1. 45 km./hr
    2. 48 km./hr
    3. 52 km./hr
    4. 54 km./hr
Correct Option: D

Let the speed of the second train be x m/s

Speed of first train =
150
= 10 m/sec
15

Relative speed of trains
= (x + 10) m/s
Total distance covered
= 150 + 150 = 300 metre
∴  Time taken =
300
x + 10

⇒ 
300
= 12
x + 10

⇒  12x + 120 = 300
⇒  12x = 300 – 120 = 180
⇒  x =
180
= 15 m/s
12

=
15 × 18
or 54 kmph.
5



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