Let's V the speed of the girl in step
v the speed of the escalator in step
L the length between ground and floor.
V*60+v*60=L ==> V+v=L/60
V*90-v*90=L ==> V-v=L/90
2V=L(3+2)/180
==>V=5L/360
Time to climb (in step) with v=0 (escalator standing still)
V*t=L==> t=L/V=L/(L*5/360)=72
The girl will count 72 steps.
The population of North Carolina was approximately 22 times larger than the population of Raleigh
Two ways are...
1. 208,561
2. write it out as two hundred eight thousand five hundred sixty-one
#. you can also write it as 200,000 + 8,000 + 500 + 60 + 1
R1t+t/2.5=1, we are told it takes both 1.5 hours so
1.5r+0.6=1
1.5r=0.4
r=4/15
So for this other pipe to fill the pool by itself...
4t/15=1
4t=15
t=15/4
t=3.75 hours
check..
4t/15+t/2.5=1
(4t+6t)/15=1
10t=15
t=15/10
t=3/2
t=1.5 hours, correct (for both pipes filling the pool)
Answer:
<h2>N(c, b)</h2>
Step-by-step explanation:
If N is midpoint between Q and R, then use the formula of a midpoint:
We have the points Q(0, 2b) and R(2c, 0). Substitute:
