Question
Mary took 1 h 40 min to make a candle. Cathy took 40 min less time than Mary while Shiyun took 40 min longer that Cathy to make a candle. How long did Shiyun take to make a candle? Express your answer in h and min.
4 m

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Mary took 1 h 40 min to make a candle. Cathy took 40 min less time than Mary while Shiyun took 40 min longer that Cathy to make a candle. How long did Shiyun take to make a candle? Express your answer in h and min.