Answer: This is a problem of solving a system of linear equations. Let x be the speed of Jim in still waters, and y be the speed of the stream. Then we have:
{x+y=15/tx−y=9/t
where t is the time it takes Jim to go upstream or downstream. We can solve this system by adding the two equations and eliminating y:
2x=24/tx=12/t
Then we can substitute x into one of the equations and solve for y:
y=15/t−12/ty=3/t
Since we know that the speed of the stream is 2 mph, we can equate y to 2 and solve for t:
3/t=2t=3/2
Finally, we can plug in t into the expression for x and find the speed of Jim in still waters:
x=12/tx=12/(3/2)x=8
Therefore, Jim can go 8 mph in still waters.
Answer:
Time taken to go downstream = 4 / ( 2 + S) where S is the speed of the river
TIme taken to go upstream = 1 / ( 2 - S )
Since the time taken is the same in each case we can equate both of them
1 / ( 2 - S) = 4 / ( 2 + S )
2 + S = 8 - 4S
5 S = 6
S = 6 / 5
= 1.2 mph
Answer:
.
Step-by-step explanation:
Given : You have the numbers 1-24 written on a slip of paper if you choose one slip at random .
To find : what is the probability that you Will Not select a number which is divisible by 3.
Solution : We have given that numbers from 1 to 24
Numbers divisible by 3 area 3,6,9,12,15,18,21,24.
There are 8 numbers which are divisible by 3
So, numbers which are not divisible by 3 are 24 -8 =16.
Probability of number which are not divisible by 3 = .
Probability of number which are not divisible by 3 = .
Therefore, .
Answer:
he would need 2 bags of sand
36x6x2.4 = 518.4
.15 cubic feet is 259.2 cubic inches
518.4 divided by 259.2 = 2
Step-by-step explanation:
Answer:
Step-by-step explanation:
The initial temperature at 9 am:
At 12 hr is 2 degrees higher:
At 15 hr is 3 degrees higher than 12hr:
Finally, at 21 hr, is 9 degrees lower than 15 hr:
Answer:
D
Step-by-step explanation: hope this helps