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  1. Two trains 108 m and 112 m in length are running towards each other on the parallel lines at a speed of 45 km/hr and 54 km/ hr respectively. To cross each other after they meet, it will take
    1. 12 sec
    2. 9 sec
    3. 8 sec
    4. 10 sec
Correct Option: C

Relative speed = 45 + 54 = 99 kmph

= 99 ×
5
m/sec.
18

or  
55
m/sec.
2

∴   Required time =
108 + 112
55
2

=
220 × 2
= 8 seconds
55


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