Algebra 1

Two bullet trains leave the station at the same time traveling in opposite direction. The northbound train goes 125 mph and the southbound train goes 120 mph. After how long will they be 735 miles apart?

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  1. distance=relative velocity*time
    735=(125+120)t
    solve for t.

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  2. Let the time traveled by each one be t hrs
    distance gone by first = 125t miles
    distance gone by 2nd = 120t miles

    125t + 120t = 735
    245t = 735
    t = 3

    After 3 hrs, they will be 735 miles apart

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