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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 hr D: 1hr

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 hr
D: 1hr
    

Grade:11

1 Answers

Khimraj
3007 Points
2 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.

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