Heat oven to 375°F. In small bowl, mix sugars, tapioca, cinnamon, salt and orange juice. Make pie crusts as directed on box for Two-Crust Pie using 9-inch glass pie plate. Place rhubarb in crust-lined plate; sprinkle with half of sugar mixture. Top with peaches; sprinkle with remaining sugar mixture. Top with second crust and flute; cut slits in several places. Bake 35 minutes.
Meanwhile, in small bowl, mix topping ingredients; sprinkle over top crust. Bake 10 minutes longer or until golden brown. Cool at least 2 hours before serving.