Answer:
 Cost of peach = 0.30$
 Cost of honeydew melon = 1.20$
Step-by-step explanation:
 Let us assume that cost of peach to be x.
 So we have cost for the honeydew melon = Four times of the cost of peach
 = 4x
 Total cost = Cost of honeydew melon + Cost of peach
 = 4x+x = 5x
 We also have total cost = $1.50
 So equating both
 5x = $1.50
 x = 1.50/5 =0.30$
 So cost of peach = 0.30$
 Cost of honeydew melon = 4x = 4*0.30 = 1.20$