It takes a boat 2 hrs to travel 16 miles down stream. The same boat takes 4 hrs for the return trip.?
Whats the speed of the water?
- JulianLv 68 years agoFavorite Answer
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
- Anonymous8 years ago
The speed of the boat + the river is its speed downstream, so
speed = distance/time
= 8 m/hr
The speed of the boat - the river is its speed upstream, as the water is travelling the opposite direction to the boat, so
speed = 16/4
= 4 m/hr
let the speed of the boat = b, and the speed of the water = w
b + w = 8
b - w = 4
add the two equations together to get
2b = 12
b = 6
Substitute into one of the above equations
6 + w = 8
w = 2 miles/hour
- 8 years ago
S=vxt so v=s/t.
S= 16 miles
t= 4 hrs
v= 16/4 = 4 miles per hour.
That should be the correct answer.
v = speed
S= distance travelled
Whoops, used the Dutch formula, I believe the English formula is D=Rxt or something like that.
So S= D, v=R and t stays t. Sorry!Source(s): Physics
- panozzoLv 44 years ago
formula of velocity: v=d/t, the place V is velocity, D is distance and T is time. appearing some rearranging we get that t=d/v In equation under v is velocity of the boat and r is the fee of the flow 40 8/(v+r)=3 40 8/(v-r)=12 fixing that equation we get that r=6