A railway train runs for 30 minutes at a speed of 40 m. p. h. and then because of repair ou track runs for 10 minutes at a speed of 8 m. p. h. after which it resumes its previous speed und runs for 20 minutes except for a period of 2 minutes when it had to run over a bridge 1 speed of 30 m. p. h. What is its average speed ?
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