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What will be the average sailing speed for the whole journey, if a ship sails out to an island at the rate of 15 km/h and sails back to the starting point at 10 km/h?

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12.5 km/hr

15.5 km/hr

14.5 km/hr

13.5 km/hr

answer is A.

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Detailed Solution

We have to find the average sailing speed for the whole journey, if a ship sails out to an island at the rate of 15 km/h and sails back to the starting point at 10 km/h.
We know that,

Mean= Sum of all observations Number of observations

So, the average speed,
=

Sum of all speeds Number of speeds

Therefore, we have,

Average sailing speed = 15 + 10 2 = 252 = 12.5 k m / h

So, the average sailing speed is 12.5 km/h.
Therefore, option 1 is correct.

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