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A ship sails out an island at the rate of 15km/hr and sails back to the starting point at 10km/hr . Find the average sailing speed an average speed fo

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A ship sails out an island at the rate of 15km/hr and sails back to the starting point at 10km/hr . Find the average sailing speed an average speed for the whole journey.
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Correct Answer - 12 km/hr
Let the distance of one side journey be x km. then ,
total time taken = `( x/15 + x/10) hr = ((5x)/30) hr = (x/6)` hr.
Average speed for the whole journey = `{ (2x)/((x//6))}` km/hr = 12 km/hr .
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