A man can row his boat with the stream at 6km/h and against the stream in 4 km/h. The man’s rate is?
1 kmph
5 kmph
8 kmph
3 kmph
Explanation:
If speed of boat=x
And speed of river=y
Then,
x-y=4 [x=4+y---->{1}]
x+y=6 ---------->{2}
Substituting eqn. 1 in 2
4+y+y=6
2y=6-4
y=2/2
y=1 ------------> {3}
Sub. Eqn. 3 in 1
x=4+y
x=4+1
x=5
Hence, speed of boat is 5 kmph.
If speed of boat=x
And speed of river=y
Then,
x-y=4 [x=4+y---->{1}]
x+y=6 ---------->{2}
Substituting eqn. 1 in 2
4+y+y=6
2y=6-4
y=2/2
y=1 ------------> {3}
Sub. Eqn. 3 in 1
x=4+y
x=4+1
x=5
Hence, speed of boat is 5 kmph.