A ship sails out to a mark at the rate of 12 kmph. and sails back at the rate of 8 kmph. The average rate of sailing is ? Options: A) 5 km/hr B) 9.6 km/hr C) 12.5 km/hr D) 25 km/hr E) None
Answer   Average = ( 2uv / u +v ) km/hr   = ( 2 x 12 x 8 ) / (12 +8 ) km/hr.   = 9.6 km/hr.   Correct Option: 9.6 km/hr
<result>B</result>
A ship sails out to a mark at the rate of 12 kmph. and sails back at the rate of 8 kmph. The average rate of sailing is ?