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

A. 5 km/hr

B. 12.5 km/hr

C. 12 km/hr

D. none of these

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speed from jetty to the point = 15 km/hr

speed coming back to jetty = 10 km/hr

therefore average speed = 15+10/2 = 12.5

Correct Option: C

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Solutions :

Average = ( 2uv / u +v ) km/hr

= ( 2 x 15 x 10 ) / (15 +10 ) km/hr.

= 12 km/hr.