A boat can row upstream at 12 km/h and downstream at 20 km/h. Find the speed of boat in still water and the speed of the stream.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 16 km/h, 4 km/h
$\text{Upstream speed} = u - v = 12$
$\text{Downstream speed} = u + v = 20$
$u = \frac{12 + 20}{2} = 16$
$v = \frac{20 - 12}{2} = 4$
Speed of boat in still water is $16$ km/h and speed of stream is $4$ km/h.