Two train start from same station at 11pm in opposite direction at speed of 72km/have and 63km/have at what time they will be 810km apart
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Explanation:
6 hours
explanation
72 + 63 = 135
therefore, after 1 hour distance = 135km
distance apart = 810km
therefore hours taken to apart by 810km = 810/135
810/135 = 6
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