A person can row 750 metres against the stream in 11 ¼ minutes and returns in 7 ½ minutes. The speed of the person in in still water is :
60
None of these
2 km/hr
3 km/hr
Explanation:
The speed in upstream = .75 * (4/45 )*60 = 4 kmph
The speed in downstream = .75 *(2/15) *60 = 6 kmph
Speed in still water =1/2(4+6) = 5 kmph
The speed in upstream = .75 * (4/45 )*60 = 4 kmph
The speed in downstream = .75 *(2/15) *60 = 6 kmph
Speed in still water =1/2(4+6) = 5 kmph