Answer:
Show the whole photo and you will maybe get help
Step-by-step explanation:
Answer:
1.3
Step-by-step explanation:
6.50/5
Answer:
Step-by-step explanation:
536 because it is correct
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.
I think it will be The seconds one so B
