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  1. Two trains 180 metres and 120 metres in length are running towards each other on parallel tracks, one at the rate 65 km/hour and another at 55 km/hour. In how many seconds will they be clear of each other from the moment they meet ?
    1. 6
    2. 9
    3. 12
    4. 15
Correct Option: B

Required time =
Sum of the lengths of trains
Relative speed

Relative speed = 65 + 55
= 120 kmph
Required time =
180 + 120
120 × 5
18

=
300 × 18
= 9 seconds
120 × 5



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