Question 268701
This is an RTD problem. Here is a table based on the given information
cars . . . . . . . . . rate . . . . . . . . .time . . . . . . . . distance
A. . . . . . . . . . . .60. . . . . . . . . . x . . . . . . . . . . . .60x
B. . . . . . . . . . . . 70 . . . . . . . . . .x -2 . . . . . . . . . 70x - 140
since the distances are equal, we get
60x = 70x - 140
subtract 70x to get
-10x = -140
x = 14
It will take 14 hours for B to reach A
60*14 = 840 miles