Two train are moving in opposite direction with speed of

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Two train are moving in opposite direction with speed of 6 m/s and 12 m/s, respectively. Find their relative speed. ?

1. 18 m/s
2. 15 m/s
3. 20 m/s
4. 6 m/s

Correct Option: A

When two trains are moving in opposite directions then their relative speed is equal to the sum of the speed of both the trains.
∴ Required relative speed = 6 + 12 = 18 m/s