Question
Lee spent 2 h 50 min to complete his Physic and Biology assignments. He spent 30 min more on his Physic assignment than his Biology assignment. How long did he take to complete his Biology assignment?
4 m

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Lee spent 2 h 50 min to complete his Physic and Biology assignments. He spent 30 min more on his Physic assignment than his Biology assignment. How long did he take to complete his Biology assignment?