Neelam and Manisha starting from the same place run at a rate of 7 kmph and 9 kmph respectively. What time will they take to be 12 km apart, If they walk in the same direction?

Neelam and Manisha starting from the same place run at a rate of 7 kmph and 9 kmph respectively. What time will they take to be 12 km apart, If they walk in the same direction?
1). 3 hours
2). 6 hours
3). 12 hours
4). 9 hours

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