Mark and gilbert share $2400 in the ratio 3:5. How much more money does gilbert receive than mark?
The total ratio representing the amount of money shared is 3+5= <<3+5=8>>8
The fraction representing the part that mark receives is 3/8, so he receives 3/8*$2400 = $<<3/8*2400=900>>900
The fraction representing the part that Gilbert receives is 5/8, so he receives 5/8*$2400= $<<5/8*2400=1500>>1500.
Gilbert receives $<<1500-900=600>>600 more than mark. Answer: \boxed{600}.