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Posted by on Thursday, September 20, 2012 at 1:03pm.

Two cars are driving toward each other on a straight and level road in Alaska. The BMW is traveling at 115 km/h north and the VW is traveling at 54.0 km/h south, both velocities measured relative to the road. At a certain instant, the distance between the cars is 11.6 km. Approximately how long will it take from that instant for the two cars to meet?

  • physics - , Thursday, September 20, 2012 at 4:29pm

    Relative velocity is
    115+54 = 169 km/h.
    t=s/V(rel) =11.6/169=0.068 h=4.12 min

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