<image>To strengthen citizens' awareness of water conservation and make rational use of water resources, a certain city adopts price regulation measures to achieve the goal of water conservation. The city’s tap water charging prices are shown in the table. For example, if a household uses 15 cubic meters of water in January, the water fee should be: 2×10 + 3×(15-10) = 35 (RMB). (1) If this household uses 24 cubic meters of water in February, how much water fee should be charged in RMB? (2) If this household uses a total of 26 cubic meters of water in March and April (with the water usage in March not exceeding 10 cubic meters) and pays a total water fee of 60 RMB, how many cubic meters of water did the household use in March and April respectively?