Question
Irene took 1 h 30 min to make a ring. Risa took 40 min less time than Irene while Natalie took 20 min longer that Risa to make a ring. How long did Natalie take to make a ring? Express your answer in h and min.
4 m

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Irene took 1 h 30 min to make a ring. Risa took 40 min less time than Irene while Natalie took 20 min longer that Risa to make a ring. How long did Natalie take to make a ring? Express your answer in h and min.