find the HCF . 1 hr 30 min , 16 hr 15 min
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1 hr 30 min = 60+30 = 90 min
16 hr 15 min = (16×60)+15 = 960+15 = 975 min
90 = 2 × 3 × 3 × 5
975 = 3 × 5 × 5 × 13
HCF = 3 × 5 = 15
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