Discussion Forum

The speed of boat in still water is 20 km/h, if it can travel 16 km upstream in 1 h. What time it would take to travel the same distance downstream?

Answer:

Explanation:

Speed = $\frac{Distance}{Time}$

Speed of current is $x$ km/h

Upstream speed $= 20–x$

$\therefore x$ = 4 km/h

Let it takes  $y$ hrs to travel downstream

Downstream speed $=20+x$ $=\frac{16}{y}$

$24=\frac{16}{y}$

$y=\frac{2}{3}$ hrs = 40 min.