...the second equation: (C + 5) + C = 20 2C = 20 - 5 C = 15/2 C = 7.5 Use...7.5 = 5 B = 12.5 Therefore the boat in still water travels at 12.5 miles per...

3 Answers · Education & Reference · 21/03/2010

4(s + c) = 20 or 4s + 4c = 20 2(s - c) = 2 or 2s - 2c = 2 or s = 2 + c substitute second equation into first equation: 4(2 + c) + 4c = 20 8 + 4c + 4c = 20 8c = 12 c = 12/8 = 1.5 mi/hr The current speed is 1.5 miles per hour. - .--

1 Answers · Education & Reference · 02/12/2013

v = speed of the boat c = speed ot the water (current) (v+c)*2 = 16 => v+c = 8 (v-c)*4 = 16 => v-c = 4 ------------- 2c = 8-4 = 4 c = 2 answer : speed of the water = 2mph

4 Answers · Education & Reference · 05/05/2012

...of the current is 2 mph (miles per hour). So the rate of the boat in still water is v = 2c = 2 (2 mph) = 4 mph. Now we just have to confirm our answers...

3 Answers · Education & Reference · 19/10/2009

...current = c Speed of boat with current = x + c = 24/3 = 8 Speed of boat against current = x - c = 16/4 = 4 So x + c = 8 [eqn 1] x - c = 4 [eqn 2] [eqn 1] - [eqn 2] → 2c = 4 c = 2 Subs c = 2 into [eqn 1] → x + 2 = 8 x = 6 So rate...

1 Answers · Education & Reference · 19/11/2009

...24 Subtracting both sides of equation (1) from that of equation (2) 2C = 1/3 - 1/4 = 1/12 or C = 1/24 Thus the rate of the boat in still water and the rate of the current are 7/24 km/min i.e. 17.5 kmph and...

2 Answers · Education & Reference · 11/12/2007

b= speed of boat in still water c = speed of current (time) x (speed) = distance and 1 1/2 ... on top of each other b + c = 40 b - c = 30 ( now subtract) 2c = 10 c = 5 miles per hour substitute c=5 in to solve for b b +5...

1 Answers · Education & Reference · 07/06/2013

...of one another and subtract b+c = 21 b-c = 3 ------------------ 2c = 18 c = 9 miles per hour for the current speed sub...39;b' b-9 = 3 b = 12 miles per hour for the boat some free videos on this concept at http://www.kjaro...

1 Answers · Education & Reference · 10/06/2013

...45/2.5 = 18 mph On the return trip, the speed of the boat - speed of the current = 45/2.75 = 16 1/2.75 mph (~ 16.3636...the first equation: b + c = 18 (16.3636 + c) + c = 18 2c = 18 - 16.3636 2c = 1.6364 c = 0.818 mph = Speed...

2 Answers · Education & Reference · 09/02/2012

... and returns upstream in 12 hours. Let b = rate of boat , c = rate of current down: 1) 48 = (b + c)2 48 = 2b + 2c 24 = b + c 24 - c = b up: 2) 48 = (b - c)12 48 = 12b - 12c 4 = b - c 4 + c...

3 Answers · Education & Reference · 07/11/2009