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Physics

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A car leaves a city at 70 km/hr. After 15 minutes, another car follows at 80 km/h. How long will it take for the second car to reach the first, and at what distance?

  • Physics -

    First, make sure all units are compatible:

    Convert 15 minutes to hours, since the speeds are listed in km per hour.

    15 minutes / 60 min/hr = .25 hours

    Set up algebra equations:
    Then let x be the distance traveled by the car that travels at 70 km/hr

    Let y be the distance traveled by the car that travels at 80 km/hr

    Let t be the time
    When the second car starts, the first car has already traveled 70 km/h * .25 h = 17.5 km

    x = 17.5 + 70*t
    y = 80 * t

    The cars will meet when x = y, or when

    80*t = 17.5 + 70*t

    Solve for t, the time at which they meet. Plug back t into the equation for x or y to find the distance at which they meet.

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