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2 January, 08:34

Randy had a lot of homework tonight. He needs to work for 45 minutes on social studies 40 minutes on science and 1 hour and 15 minutes on math. It will also take him 10 minutes to get ready for bed. If he wants to be in bed at 10:00on what time does he need to start his homework?

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  1. 2 January, 10:38
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    Answer: He needs to start his homework at 7:10.

    Step-by-step explanation:

    Hi, to answer this question we have to add all the times:

    45 min (social studies)

    40 minutes (science)

    75 minutes (math) (1 hour and 15 minutes = 75 minutes)

    10 minutes (to get ready)

    Mathematically speaking:

    45+40+75+10 = 170 minutes

    If 60 minutes equals to 1 hour:

    170/60 = 2.83 =

    The hour is the integer part (2 hours)

    The minutes is the decimal part multiplied by 60

    0.83 x 60 = 50 minutes

    So, 2 hours and 50 minutes, before 10:00.

    10:00 - 2:50 = 7:10
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