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Math Help - units problem

  1. #1
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    Red face units problem

    subtract
    3hr 2 min from 7 hr


    which is larger
    700000 mg or 5 kg

    7min 18 sec + 81 sec + 3 min 17 sec =
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  2. #2
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    7hr - 3hr 2min = 420mins - 182mins = 238mins = 3hrs 58mins

    700000mg = 700g = 0.7kg < 5kg

    7 min 18 sec + 81 sec + 3min 17 sec = 438 sec + 81 sec + 197 sec
    =716sec = 11mins 56 sec
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by BeBeMala View Post

    subtract
    3hr 2 min from 7 hr
    Code:
     
    7 hr 0 min ===>6 hr 60 min
    3 hr 2 min ===>3 hr  2 min
    --------------------------
                   3 hr 58 min
    Quote Originally Posted by BeBeMala View Post

    which is larger
    700000 mg or 5 kg
    5kg = 5(1000g) = 5000g

    700000mg = (700000/1000)g = 700g

    Quote Originally Posted by BeBeMala View Post
    7min 18 sec + 81 sec + 3 min 17 sec =
    Code:
     
    7   min  18   sec
             81   sec
    3   min  17   sec
    -------------------
    10  min 116   sec ===>11 min 56 sec
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