Ram can row upstream a boat at 10 km/hr and downstream at 18 km/hr. The rate at which be rows the boat in still water is :
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 14 km/hr
Let the speed of the boat be $x$ km/hr and speed of current be $y$ km/hr.
Upstream speed = $x-y=10\,km/hr$
Downstream speed = $x+y=18\,km/hr$
Add both the equation,
$⇒2x=28$
$⇒x=14\,km/hr$