Question

a boat moves downstream at 1 km in 5 minutes and upstream at 1 km in 12 minutes. what is the speed of current?

Answer 1

solution:

[tex]downstream a =\frac{1}{(\frac{6}{60})}=\frac{60}{6}=10km/hr\\ upstream b = \frac{1}{(\frac{10}{60})}=\frac{60}{10}=6km/hr\\ speed of the current = \frac{(a-b)}{2}=\frac{(10-6)}\\ \frac{4}{2}\\ 2km/h[/tex]