Problema Solution
The speed of a moving walkway is 3 feet per second. Karen takes a total of 40 seconds to travel 50 feet with the movement of the walkway and back again against the movement of the walkway. What is karen's normal walking speed
Answer provided by our tutors
let
v = the Karen's normal walking speed, v>3
3 + v = Karen's speed when walking with the movement of the walkway
v - 3 = Karen's speed when walking against the movement of the walkway
we use the formula time=distance/speed
50/(3 + v) + 50/(v - 3) = 40
by solving we find:
v = 4.5 ft/s
click here to see the step by step solution of the equation:
Karen's normal walking speed is 4.5 feet per second.