5 km/hr
4 km/hr
3 km/hr
1km/hr
C. 3 km/hr
let rate upstream=x km/hr and rate downstream=y km/hr.
Then, 40/x +55/y =13… (i) and 30/x +44/y =10
Multiplying (ii) by 4 and (i) by 3 and subtracting, we get:11/y=1 or y=11.
Substituting y=11 in (i),we get:x=5.
Rate in still water =1/2(11+5)kmph=8kmph.
Rate of current=1/2(11-5)kmph=3kmph
1km/hr
2km/hr
3km/hr
4km/hr
2:1
3:2
8:3
None of these
2 km
3 km
4km
5km
40 minutes
1 hours
1 hr 15 min
1 hr 30 min
1
2
a man can row 18 kmph in still water.it takes him thrice as long to row up as to row down the river. Find the rate of stream.
6 km/hr.
7 km/hr.
8 km/hr.
9 km/hr.
2:1
3:1
3:2
4:3
2.5 km/hr
4.2 km/hr
5 km/hr
10.5 km/hr
4 km/hr
6 km/hr
8 km/hr
Data inadequate
3
5
8
9
18 km/hr
23 km/hr
22 km/hr
28 km/hr
5 km/hr
4 km/hr
3 km/hr
1km/hr
2
3
4
5
1 km/hr.
1.5 km/hr.
3.2 km/hr.
3.5 km/hr.