Answer: The cost of 1 lemon is $1.2 and the cost of 1 lime is $0.4.
Explanation:
Let x be the cost of 1 lemon and y be the cost of 1 lime.
Then for Ray, the equation representing total price will be :-
................................(1)
For Lia, the equation representing total price will be :-
..................................(2)
Dividing 2 on the both sides of equation (2), we get
...............................(3)
Subtracting (3) from (1), we get

Substitute value of x in (3), we get

Thus, the cost of 1 lemon is $1.2 and the cost of 1 lime is $0.4.