word problem of maths
2007-05-05 17:50:09 · 4 answers · asked by math 1 in Science & Mathematics ➔ Mathematics
Try using equations with 2 unknowns, you'll have a clue there.
Let x = man's rate in still water, y = rate of the stream.
if with the stream: +, if against: -
therefore: 6 = x + y, 4 = x - y.
From here you decide the method you want to use. The most practical would be elimination. Using that, the solution will be:
6 + 4 = 2x -- Elimination by addition
10 = 2x
5 = x or x = 5 km/hr. That's it.
2007-05-05 18:04:19 · answer #1 · answered by megavinx 4 · 0⤊ 1⤋
(6-4)= two times the flow rate of the river--1. Therefore, the speed in still water would be 5km/hr.
2007-05-06 00:54:02 · answer #2 · answered by bruinfan 7 · 0⤊ 0⤋
I am guessing you just find the average? So 6km with aid, 4km working harder. So if there is no aid and no extra work that means he can do regular water in 5km.
2007-05-06 00:53:46 · answer #3 · answered by lakerzz8 3 · 0⤊ 0⤋
If r is his rate and c is the current's rate, then...
r + c = 6
r - c = 4
Add the equations...
2r = 10
r = 5
His rate is 5 km/hr
2007-05-06 00:57:46 · answer #4 · answered by suesysgoddess 6 · 2⤊ 0⤋