Question

Wanda started walking along a path 2 minutes (120 seconds) before Dave. Wanda walked at a constant rate of 5 feet per second. Dave walked along the same path at a constant rate of 10 feet precession. Graph the system of linear equations. If they continue walking at these rates, when will Dave catch up to
Wanda?

Answer 1

First we write the kinematics equations:
 a
 v = a * t + vo
 r = a * (t ^ 2/2) + vo * t + ro
 For Wanda we have:
 a = 0
 v = 5
 r = 5 * t
 For Dave we have:
 v = 10
 r = 10 * (t-120)
 To solve the system of equations, we graph both functions and see where
they intersect.
 We have to intersect in the ordered pair:
 (t, r) = (240, 1200)
 answer
 If they continue walking at these rates, Dave catch up to Wanda in 240s (1200 ft)