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A motor boat can go 2 miles downstream on a river in 3 minutes it takes 15 minutes for the boat to go upstream the same 2 miles find the speed of the current?
Wiki User
∙ 13y ago
Let boat speed = X and current speed = Y
Downstream speed = boat speed plus current speed = X + Y
Upstream speed = boat speed minus current speed = X -Y
Downstream speed = 2 miles divided by 3 minutes = 2/3 miles per minute
Upstream speed = 2 miles divided by 15 minutes = 2/15 miles per minute
X + Y = 2/3
X - Y = 2/15
add equations
2X = 2/3 + 2/15 = 10/15 + 2/15 = 12/15 = 4/5
divide by 2
X = 4/10 = 2/5
use second equation and find Y as
X -Y = 2/15
2/5 - Y = 2/15
6/15 - Y = 2/15
Y = 4/15 = current speed = 0.266 miles per minute
Wiki User
∙ 13y ago
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What is the miles per hour for 1.4 miles in 20 minutes?
1.4 x 3 = 4.2 miles Note: 20 minutes = 1.4 miles : 40 minutes = 2.8 miles : 60 minutes (1 hour) = 4.2 miles
How many miles will you go in 110 minutes if you go 3 miles in 22 minutes?
3 miles in 22 2 minutes is the same speed as 15 miles per 110 minutes.
What is speed of car that travels .5 miles in .8 minutes?
.5 miles in .8 minutes = 5 miles in 8 minutes = 5/8 miles per minute = 0.625 miles per minute or 37.5 miles per hour..5 miles in .8 minutes = 5 miles in 8 minutes = 5/8 miles per minute = 0.625 miles per minute or 37.5 miles per hour..5 miles in .8 minutes = 5 miles in 8 minutes = 5/8 miles per minute = 0.625 miles per minute or 37.5 miles per hour..5 miles in .8 minutes = 5 miles in 8 minutes = 5/8 miles per minute = 0.625 miles per minute or 37.5 miles per hour.
How many miles per hour is 50 miles in 110 minutes?
50 miles in 10 minutes is the same as 300 miles per hour, since 50 miles/10 minutes * 60 minutes/1 hour = 300 miles per hour
How many minutes per mile is 13.1 miles in 110 minutes?
13.1 miles in 110 minutes is about 8.5 minutes per mile.
If a motorboat can go 8 miles downstream on a river in 20 mins if the return 8 miles upstream takes 30 minutes what is the speed of the current?
The current is approximately 4 mph.
If Tina swims 4 miles upstream at 1 mph and back downstream to the same point at 4 miles per hour what is her average speed?
2 Miles An Hour.
A boat on the Missouri river took 2 hours to go 48 miles downstream. The boat took 3 hours to return the same distance upstream. Find the rate of the boat in still water and the rate of the current.?
Boats speed = 24 miles per hour.Current speed = 4 miles per hour.
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The gradient of the River Amazon is very low. It is 1,000 miles or 1,610 kilometers upstream, and 100 feet or 30 meters downstream.
If Tina swims 4 miles upstream at 1 mph and back downstream to the same point to the same point at 4 mph what is her average speed?
8 MPH
A man rows upstream for 20 miles in 5 hours and 10 miles downstream in 2 hrs What is the speed of the man in still water?
Speed upstream(S.u) = 20/5 => 4miles/hr Speed downstream(S.d) = 10/2 => 5miles/hr Speed of man in still water(speed of boat in still water)= 1/2 * (S.u + S.d) = 0.5 * (4 + 5) = 0.5 *9 = 4.5miles/hr The speed of man in still water is 4.5 miles/hr
If Tina swims 4 miles upstream at 1 mph and back downstream to the same point at 4 mph what is her average speed?
Her average speed is 1.6 miles per hour. Average speed is total distance covered by total time taken to do it. She swims 4 miles upstream, and at 1 mph, it takes 4 hours. She comes back downstream at 4 mph and so she covers the 4 miles in 1 hour. Her total mileage is 8 miles. It takes 4 + 1 hours or 5 hours to cover it. The 8 miles divided by 5 hours is 1 3/5 miles per hour, or 1.6 mph for an average speed.
A motorboat maintained a constant speed of 24 miles per hour relative to the water going 35 miles upstream and then returning the total time for the trip was 3.0 hours What is the speed of current?
The current speed is about 4 miles per hour.
It takes a motor boat 3 hours to make a downstream trip with a current of 7 miles per hour the return trip against the same current took 5 hours find the speed of the boat in still water?
Since the distance downstream (with the current) equals the distance upstream (against the current), and if we: Let B stand for the speed (rate in mph) of the boat in still water, and using the formula rate X time = distance, the equation will be: (B+7) x 3 = (B-7) x 5 3B + 21 = 5B - 35 56 = 2B B = 28 mph Traveling downstream, the current will cause the boat to go faster so the 7 mph current is added to the boat's still water speed. Traveling upsteam the current slows or decreases the boat's rate so the current's speed is subtracted from the boat's still water speed.
If a boat can go 20 miles per hours in still water and can go six miles downstream and 3 miles up stream in the same time how fast is the river?
assume river velocity = X mph boat velocity = 20 mph time to go 6 miles downstream = T1 time to go 3 miles upstream = T2 distance = time * velocity downstream: 6 mi = T1 * (boat velocity + river velocity) upstream: 3 mi = T2 * (boat velocity - river velocity) 6 = T1 * ( 20 + X ) 3 = T2 * ( 20 - X ) T1 * ( 20 + X ) = 2 * ( T2 * ( 20 - X ) ) since T1 = T2 then 20 + X = 40 - 2X 3X = 20 X = 6.67 thus, river velocity is 6.67mph
A river has a current of 4 mph find the speed of simons boat in still water if it goes 40 miles downstream in the same time as 24 miles upstream?
Let s = unknown speed in still water in units of miles per hour. The downstream speed will then be s + 4 and the upstream speed s - 4. In an equal time t in units of hours, t(s+4) = 40 and t(s-4) = 24. Multiplying out the parenthetical expressions yields ts + 4t = 40 and ts - 4t = 24. Subtracting the second of these equations from the first gives 8t = 16, or t = 2 hours. Therefore, ts +4t = 40, by substituting 2 for t becomes: 2s + 8 = 40, or 2s = 40 - 8 = 32, or s = 16 miles per hour.
How many miles is Madison square garden from Columbia university?
5.2 Miles, 13 minutes. However, in current traffic it will take about 18 minutes.
