How to determine if 3 points are collinear?

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Is it greater than or less than7*3_9*2