Question

A man can row 8 km/hr in still water. when the river is running at 2km/hr, it takes him 3 hr 12min to row to a place and back. how far is the place.

Answer 1

let the distance be x,

while going time taken=x/(8+2)=x/10

while coming back time taken=x/(8-2)=x/6

total time=3hours 12min=3.2hours

hence x/10+x/6=3.2

8x/30=32/10

x=12

distance=12 km