Answer:
The car red is (B)
Step-by-step explanation:
To solve this you must write an expression for distance as a function of time. You know that you need that expression in those terms because you are asked to find the point where their distance traveled is equal and express the answer in terms of time.
So car A travels Distance = 60 km/hr*(1+x)
Car B travels Distance = 75 km/hr(x)
Where x is the time in hours.
Those two equations are equal when on overtakes the other
so:X=4
60 +60x = 75x
60=15x
x=4, but my expression is written to count from when car B commenced travel. So total time is 5 hours from the car A setting off.