Let's call your speed "a"
her walking speed is then "2a"
and her friend's scooter speed is 10 a
let's also call the distance you need to walk "d"
so the time (t)you need is:
d/t=a
t=d/a
and her time is:
t=

(half a distance with the speed of 2a and half a distance (d/2) with the distance of 10 a
now we count (we know that her time is 30 minutes)
30=

//multiply by 20a
600a=

600a=6d/divide by 6
100a=d
Now, in order to calculate your time we need to calculate:
t=d/a
but we know how much is d now!
t=

=100
which means that you need 100 minutes, or 1 h 40 minutes!!!
0 = x because 0 + 5 = 5 plus 2 = 7
3x-12+5-x=2x-7
2x-7 =2x-7
Means there are infinite solutions.
320, 305, 308, 340, 345,<br>315, 330, 315, 330, 318, 325 the mode median
grin007 [14]
Answer:
mode= 315, 330
median=320
Step-by-step explanation: