Answer: Train A = 50 mph; Train B = 30 mph
Step-by-step explanation:
In this case, let's call the speed of both trains as:
Va: speed of train A
Vb: speed of train B
As train A is faster than train B, let's call speed of train B as X; So if Vb is X, then Va would be:
Vb = X
Va = X + 20
If we combine both Speed, we have:
V = Va + Vb = X + X + 20 = 2X + 20
Now that we have an expression for the combined speed, let's recall the formula for speed in general:
V = d/t
Where:
d: distance = 240 miles
t: time = 3 hours
Combining all the data we have:
V = 240/3
but V is 2X + 20 so:
2X + 20 = 240/3
Solving for X:
2X + 20 = 80
2X = 80 - 20
2X = 60
X = 60/2
X = Vb = 30 mph
Now that we know speed of one train, we can know the speed of the other train:
Va = 30 + 20 = 50 mph
Hope it will help u.........
Answer:
the width is 13.11meter and the length is 1.11meter
Step-by-step explanation:
let the width be x and the length be x-12
area = 160 = l×b = x×x-12
x×x-12 = 160
x^2 = 172
x= 13.11
thus, the width is 13.11 and the length is 1.11
P(the students she selects are both boys)=7/12×5/10=35/120=7/24
The inequality becomes :
350B+525F≤4500
Explanation:
Let the number of basil plants be represented by = B
Let the number of fennel plants be represented by = F
As each basil plant needs 350 ml of water, so B basil plants will need 350*B = 350B ml of water
Similarly, each fennel plant needs 525 ml of water so F fennel plants will need 525*F = 525F ml of water.
And both the plants need to be watered with a maximum of 4500 ml of water.
So inequality becomes: 350B+525F≤4500
