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
Join The Discussion
Comments ( 2 )
Related User Ask Questions
Which of the following is not a primary function of a Bank?
A. Granting Loans
B. Collecting Cheques/Drafts customers
C. Facilitating import of goods
D. Issuing Bank Drafts
A. Regulatory jurisdictional fight between SEBI and IRDA
B. They don’t offer better tax benefits
C. They offer lesser returns compared to traditional insurance policies
D. All of the above
The Chameli Devi Jain Award is given for an outstanding woman ____?
A. Scientist
B. Reporter
C. Player
D. Teacher
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
--------------------------------------------
Solutions :
Average = ( 2uv / u +v ) km/hr
= ( 2 x 15 x 10 ) / (15 +10 ) km/hr.
= 12 km/hr.