Days, hours, minutes

Add the following:
1 day 18 hr 45 m 55 sec,
13 hr 55 m 58 sec and
23 hr 49 m 45 sec

Correct answer:

s =  38
m =  31
h =  8
d =  3

Step-by-step explanation:

s0​=55+58+45=158 m0​=⌊s0​/60⌋=⌊158/60⌋=2 s=s0​−60⋅ m0​=158−60⋅ 2=38
m1​=m0​+45+55+49=2+45+55+49=151 h0​=⌊m1​/60⌋=⌊151/60⌋=2  m=m1​−60⋅ h0​=151−60⋅ 2=31
h1​=h0​+18+13+23=2+18+13+23=56 d0​=⌊h1​/24⌋=⌊56/24⌋=2  h=h1​−24⋅ d0​=56−24⋅ 2=8
d=d0​+1+0+0=2+1+0+0=3  3d 8h 31m 38s

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You need to know the following knowledge to solve this word math problem:

arithmeticUnits of physical quantitiesGrade of the word problem

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