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 Four cars (Posted on 2008-06-09)
Four cars travel at constant speed along a road. Three of them (A, B and C) travel in one direction, and the fourth, D, in the opposite direction.

Car A passes B and C at 9:00h and 10:00h, respectively, and crosses car D at 11:00h.

Car D crosses car B and car C at 13:00h and 15:00h, respectively.

At what time did car B pass car C?

Bonus point: can you solve this geometrically?

 Submitted by pcbouhid Rating: 4.2500 (4 votes) Solution: (Hide) Both the analytical solution and the geometric solution can be found in the comments. The later is more easily achieved if we make car C stationary, and all the others trajectories relative to it.Car B passed car C at 11:40h.

 Subject Author Date re(3): Geometric Solution -SAME HERE pcbouhid 2008-06-11 15:32:37 re(2): Geometric Solution -SAME HERE Ady TZIDON 2008-06-10 16:18:12 re: Geometric Solution pcbouhid 2008-06-10 09:07:29 Geometric Solution Robby Goetschalckx 2008-06-10 06:39:29 Solution Bractals 2008-06-09 18:37:04 solution Charlie 2008-06-09 13:40:19

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