A train b speeding with 120 kmph crosses another train c running in the same direction, in 2 minutes. if the lengths of the trains b and c be 100 m and 200 m respectively, what is the speed (in kmph) of the train c?
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Let Speed of C = C m/s
Since, both the trains are travelling in same direction, so relative speed = ([100/3) – C] m/s
To cross the train C, B will have to travel the distance equal to length of B + length of C
Time = 2 mins = 2 × 60 second
Since, Time = Distance / Relative Speed
⇒2×60=100+200/100/3−c
⇒ 4000 – 120C = 300
⇒ C = 370/12 m/s
⇒ C = (370/12) × (18/5) = 111 kmph
Since, both the trains are travelling in same direction, so relative speed = ([100/3) – C] m/s
To cross the train C, B will have to travel the distance equal to length of B + length of C
Time = 2 mins = 2 × 60 second
Since, Time = Distance / Relative Speed
⇒2×60=100+200/100/3−c
⇒ 4000 – 120C = 300
⇒ C = 370/12 m/s
⇒ C = (370/12) × (18/5) = 111 kmph
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