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

18 m/s
15 m/s
20 m/s
6 m/s

Correct Answer: 18 m/s

Explanation:

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

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