48. A bird flew at 20 km per hour for first 4 hours, then mt 12 km per hour for next 3 hours. With what average speed did the bird fly? hr (B) 16 km per hrs. ts (A) 16 km per hrs. (C) 16.4/7 km per his hrs. (D) 16km per brs.
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Answer: 16 km / hour
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