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23 January, 17:30

What time must a roast be placed in the oven to be ready by 5:30 if the roast takes 2 hours and 40 minutes to cook?

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Answers (2)
  1. 23 January, 18:03
    0
    2 hours 40 mins = 2 hours + 30 mins + 10 mins

    So we will break it into 3 steps (1) 2 hours (2) 30 mins (3) 10 mins

    Step (1):

    5:30 → Count back 2 hours = 3.30

    Step (2):

    3.30 → Count back 30 mins = 3.00

    Step (3):

    3.00 → Count back 10 mins = 2:50

    Answer: The roast needs to be in the oven at 2:50
  2. 23 January, 18:11
    0
    5:30 - 2:40 = (5 - 2) : (30 - 40) = 3: (-10) = 2:50

    The roast must go into the oven at 2:50.
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