Question

A ship sails out to an island at the rate of 15 km per hour and sails back to the starting point at 10 km per hour .find the average sailing speed for the whole journey.

Answer 1

Hey mate !

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To solve this kind of question, see the following formulas ;

$\mathsf{time = \frac{distance}{speed}}$


And

$\mathsf{average \: speed = \frac{total \: distance \: travelled}{total \: time \: taken} }$


Now,

For Solution of your question, refer to the attached picture.

The final answer is;

The average speed of the ship in the whole journey was 12 km / h.

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Thanks for the question !

☺️☺️☺️

Answer 2

The average sailing speed of the ship is 12.5 km/hr.

Step-by-step explanation:

Given:

The speed of the ship while sailing towards the island= 15km/hr

The speed of the ship while sailing back = 10km/hr

To find = the average speed for the journey

Solution:

The average velocity of a vehicle is given by = Speed1+ Speed÷Total number of speeds

On plugging the values in the equation:

average sailing speed for the whole journey = 15+ 10÷2

25÷2 = 12.5km/hr

Result:

The average sailing speed for the whole journey is 12.5 km/hr.

(#SPJ2)