There are n plates, numbered 1,2,3, ..., n, which are placed in a line. Eclairs are placed on these plates. Every alternate plate starting from plate 3 has 90 more eclairs than the previous plate. Every alternate plate starting from plate 2 has one-third of eclairs as compared to the previous plate. The plate 5 has 240 eclairs. What is the difference between the num ber of eclairs the plates numbered 3 and 5?

1) 210
2) 360
3) 90
4) 240