Question

A man travels due north in order to cross a river 5km wide following due East as 3km/h.If he can row at 10km/h in still water.How far from his destination will he land if he ignorantly steers northward

Answer 1

The moving time of the man across the river

$t=5/10=0.5\ (h)$ . So,

$s=vt=3\cdot0.5=1.5\ (km)$ . Answer