Anyone knows this sum? How can he assume that AC is 12kms? Can we use 15kms in a similar way?

Hey, 1 hour is assumed for travel between A and C, which give AC=12km. since, it is a 30-60-90 triangle, AB and BC and can be derived using 12km We can clearly see using 15kmph, time taken to travel using AB and BC is greater than 1 hour.

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