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3.4 h = 3 h +  0.4 * 60 = 3 h 24 min

4.25 h = 4 h + 0.25 *60 = 4 h 15 min

2.5 h = 2 h + 0.5 *60 = 2 h 30 min

0.6 h = 0.6 *60 = 36 min