A ship sails out to a mark at the rate of 15 kmph and sails back at the rate of 10 kmph. The average rate of sailing is:

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Solution

The correct option is B
12

$\frac{2 xy}{x + y} = 12$

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Similar questions

Q. 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. Find the average sailing speed for the whole journey.

Q. Two ships

A

and

B

are sailing straight away from a fixed point

O

along routes such that

∠ A O B

is always

120^{\circ}

. At a certain instance,

O A = 8

km,

O B = 6

km and the ship

A

is sailing at the rate of

20

km/hr while the ship

B

sailing at the rate of

30

km/hr, then the distance between

A

and

B

is changing at the rate (in km/hr) :

Two ships A and B are sailing straight away from the fixed point O along the routes such that $∠ A O B = 60^{\circ}$ always.At a certain instance, OA = 4 km, OB = 3km and ship A is sailing at the rate of 20km/hr and ship B is sailing at the rate of 30km/hr. Then the distance between A and B is changing at the rate (in km/hr) :