Speed is the ratio of distance and time.
So, average speed= Total distance/ total time.
Let's assume t is the time taken for going from New Orleans to Boston and it's taking 1 hour less to return back. So, time taken for return back is t-1.
Given the speed from New Orleans to Boston is 40 mph. So,
Distance = Speed * time
So, d =40 t
Hence t= d/40
Similarly Distance for returning back:
d =80 (t-1)
d/80 = t-1 (Dividing 80 to each sides)
Now the total distance= d+ d = 2d
And total time : t + t -1= d/40 + d/80
So, the average speed =
= (cancel out d )
Common denominator of 40 and 80 is 80. So, multiply each terms by 80.
=
=
=
=53.33 mph
So, the average speed is 53.33 mph.
Answer:
16.3420
Step-by-step explanation:
here is what I got
Total boys = 10 + 7 +10 + 9 = 36
Probability of picking a senior = 9/36 , reduces to 1/4
Total girls = 8 + 11 + 9 + 7 = 35
Probability of picking a senior = 7/35, reduces to 1/5
Probability of picking both multiply the probability of each by each other:
= 1/4 x 1/5 = 1/20
Answer is D.
M in (-oo:+oo)
m+11 = (1/4)*m-(2*m) // - (1/4)*m-(2*m)
m-((1/4)*m)+2*m+11 = 0
m+(-1/4)*m+2*m+11 = 0
11/4*m+11 = 0 // - 11
11/4*m = -11 // : 11/4
m = -11/11/4
m = -4
m = -4
The answer is 0.006220839