# A boatman row 10 km/hr in still water river flows at 6km /hr if he cross the river from one blank to other along shortest possible path, time taken to cross the river of width 1km is,Option:-a: 1/8hr b: ¼ hr c: ½ hrD: 1hr

Khimraj
3007 Points
3 years ago
if he travels  along shortest possible path then velocity along shortest path will be 8 km/hr
because 10sin$\Theta$ should be 6 so 10cos$\Theta$ will be 8.
so time taken will be 1/8 hr.
Hope it clears.