Question

find the HCF . 1 hr 30 min , 16 hr 15 min
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Answer 1

17 hours 45min add the both sum ok

Answer 2

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