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7 April, 19:27

While driving from A-ville to B-town, Harriet drove at a constant speed of 115 kilometers per hour. Upon arriving in B-town, Harriet immediately turned and drove back to A-ville at a constant speed of 135 kilometers per hour. If the entire trip took 5 hours, how many minutes did it take Harriet to drive from A-ville to B-town?

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  1. 7 April, 19:39
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    162 minutes

    Explanation:

    Parameters given:

    Harriet's speed from town A to B = 115 km/hr

    Harriet's speed from B to A = 135 km/hr

    Total time taken = 5 hours

    We know that the distance from A to B is constant and the same as the distance from B to A.

    Distance given in terms of speed and time as:

    Distance = speed * time.

    Let the time taken to get from A to B be x hours. Hence, the time taken to get from B to A will be:

    Time = (5 - x) hours

    The distance between A and B will be:

    D (A, B) = 115 * x

    The distance between B and A will be:

    D (B, A) = 135 * (5 - x)

    Since D (A, B) = D (B, A),

    => 115 * x = 135 * (5 - x)

    => 115x = 675 - 135x

    115x + 135x = 675

    => 250x = 675

    x = 675/250 hours

    x = 2.7 hours = 2.7 * 60 minutes

    x = 162 mins

    Therefore, it took 162 minutes for Harriet to get from town A to B.
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