A ship sails out to a mark at the rate of 15 kmph. and

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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 ?

1. 5 km/hr
2. 12 km/hr
3. 12.5 km/hr
4. 25 km/hr

Correct Option: B

Average = ( 2uv / u +v ) km/hr
= ( 2 x 15 x 10 ) / (15 +10 ) km/hr.
= 12 km/hr.