Are you cooking the rice and curry together or warming them together? I have a pretty good microwave and no way will it cook rice in 4 minutes. Cooking and warming are two different time zones. If it's to already prepared dishes that are being heated to serve as meal, I would start the 7 minute product and give it 3 or 4 minutes, then add the 4 minute dish. If the food isn't hot enough at the end of 7 minutes, which I doubt it will be, give the microwave a little more time. The directions on the package are really suggestions according the equipment the kitchen lab at the plant that made the food. If your microwave is a different machine, the time might be longer or shorter. And I would not bother with divided/sectioned cooking dishes. The thrift stores are jam packed full of magical microwave cooking vessels.