If a motorboat moves upstream at the rate of 12 km/hr and downstream at the rate of 18 km/hr, then the speed of the current is:
Answer & explanation
Correct answer: option 1
The correct answer is Option (4) → 10 km/hr
$\text{Upstream speed} = 12,\quad \text{Downstream speed} = 18$
$\text{Speed of current} = \frac{18 - 12}{2} = 3$
$\text{Speed of current} = 3\ \text{km/hr}$