A, B and C start together from the same point to travel around a circular island 30 km in circumference. A and B are travelling in the same direction and C is in the opposite direction. If A travels 5 km, B travels 7 km and C travels 8 km. in an hour, then they all come together again after:

1)25 h

2)30 h

3)15 h

4)20 h

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    30 h

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