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14 November, 09:42

During a storm, two teams of scientist leave a university at the same time in vans to search for tornadoes. The first team travels east at 20 miles per hour and the second travels west at 25 mph. If their radios have a range of up to 90 miles, how long will it be before they lose radio contact?

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  1. 14 November, 09:52
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    Their contact will end after 2 hours.

    Step-by-step explanation:

    Let east be positive and west be negative.

    The first team travels east at 20 miles per hour.

    Speed of first team = 20 mph

    The second team travels west at 25 mph

    Speed of second team = - 25 mph

    Relative speed = 20 - (-25) = 45 mph

    Range of radio = 90 miles

    We need to find how long will it be before they lose radio contact.

    Distance = Time x Speed

    90 = Time x 45

    Time = 2 hours

    Their contact will end after 2 hours.
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