Two friends walking at 7 kmph and 8 kmph start at the same time from two different towns 45 km apart towards each other. They will meet each other after.

Two friends walking at 7 kmph and 8 kmph start at the same time from two different towns 45 km apart towards each other. They will meet each other after.
1). 5 hours
2). 6 hours
3). 2 hours
4). 3 hours

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