A car and a van started from two cities at the same time and travelled towards each other at
steady speeds. The car took 4 hours to cover the distance between the two cities and the van
took 6 hours. After what amount of time did they pass each other?

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asked by gary
  1. This is just a work problem in disguise. Together the cars must cover a distance.

    1/x = 1/4 + 1/6 = 5/12
    x = 12/5

    Check. Say the distance is 120 miles
    In 2.4 hours, the car covers 2.4/4 = 0.6 the distance.
    In 2.4 hours, the van covers 2.4/6 = .4 the distance. ok

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    posted by Steve

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