maths

A freight train leaves a station traveling at 32 km/h. Two hours later, a passenger train leaves
the same station traveling in the same direction at 52 km/h. How long does it takes the passenger
train to catch up to the freight train?

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  1. 32 (t + 2)= d

    52 t = d
    so
    32 t + 64 = 52 t

    20 t = 64

    t = 3.2 hours and 12 minutes
    ==========================
    check
    32 * 5.2 = 166.4
    52 * 3.2 = 166.4
    good

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  2. the freight train has a 64 km head start ... 32 kph * 2 h

    the passenger train closes the distance at 20 kph ... 52 kph - 32 kph

    64 / 20 = ?

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