Answer:
x = 7/3
Step-by-step explanation:
To find the of x, isolate it from the other numbers (moving everything to the other side)
What you do to one side, you must do to the other:
3x + 8 = 15
3x + 8 - 8 = 15 - 8 (subtract 8 on both sides to rid of the "+ 8")
3x = 7
3x/3 = 7/3 (divide by 3 on both sides to rid of the 3 attached to "x")
x = 7/3
The solution for the problem:
let x be the travel time of Dave
x + 120 be the travel time of Wanda
using the distance formula which is: speed * travel time = distance (which will be the same for both Wanda and Dave)
10x = 5(x+120)
10x = 5x + 600
5x = 600x = 120
Dave will catch up after 120 seconds.
