83) A ship sails out from jetty to a mark at the rate of 15
km/hr. and sails back to jetty at the rate of 10km/hr. The
average speed of sailing is
A) 5 km/hr
B) 12 km/hr
C) 12.5 km/hr
Shife: Spiral
Jelly-sped
D) 25 km/hr
Answers
Answered by
1
Answer:
(c) 12.5 km/hr
Step-by-step explanation:
Let u=15 km/hr amd v=10 km/hr for the ship.
we know that, Average Velocity = 1/2(v+u)
so, applying the formula
Average Velocity = 1/2(v+u)
=> Average Velocity = 1/2(15+10) km/hr
=> Average Velocity = 1/2 x 25 km/hr
=> Average Velocity = 12.5 km/hr
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