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31 July, 11:18

The first stage of a rocket burns 28 seconds longer than the second stage. If the total burning time for both stages is 152 seconds then how long does each stage burn? Solve.

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  1. 31 July, 13:44
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    The 1st stage: x, the 2nd stage: y.

    x + y = 152

    x = y + 28

    y + 28 + y = 152

    2 y = 152 - 28

    2 y = 124

    y = 124 : 2 = 62

    x = 62 + 28 = 90

    Answer: the first stage burns 90 seconds and the second burns 62 seconds.
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