The distance covered by a moving object is calculated through multiplying the speed and the time it takes to cover the distance. In this item, we let x be the time. The distances covered by the two vehicles are as follows,
 SUV A = 49x
 SUV B = 43x
These distances should add up to 460 km. Thus,
 
 49x + 43x = 460 
The value of x from the equation is 5 hours.
Answer: 5 hours