Answer:
detail in steps
Explanation:
Red car: 150 / 60 = 2.5 hour s for the travel
Blue car: 150 / 25 = 6 hours, it start 2.5 hours earlier
2.5 + 2.5 = 5 it still has 6 - 5 = 1 hour away to the end point while Red car is at end point.
* Red car will pass Blue car to arrive end point earlier.
When Red car will pass Blue car:
25 * ( 2.5 + x) = 60 x
62.5 + 25x = 60x
35x = 62.5
x = 62.5 / 35 = 12.5 / 7 = 1.79 hour after Red car started
i.e at 60 x 1.79 = 107.4 miles from start point the Red car will pass Blue car