Ben and frank work in the kitchen of a busy restaurant. ben takes two hours to wash 500 dishes and frank takes three hours to wash 450 dishes. they simultaneously start washing the tremendous stack of 975 dirty dishes from the busy dinner rush. Ben leaves work early and frank spends the last half hour of dish washing duty by himself. How long did frank spend washing dishes?
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Home » Mathematics » Ben and frank work in the kitchen of a busy restaurant. ben takes two hours to wash 500 dishes and frank takes three hours to wash 450 dishes. they simultaneously start washing the tremendous stack of 975 dirty dishes from the busy dinner rush.