PT. Usha runs for 10 minutes at a speed of 18 Km/hr, for 45 minutes at a speed of 27Km/hr
and for 5 minutes at a speed of 36 Km/hr. Calculate her average speed.
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The answer is 4500 is the average speed
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Pilavullakandi Thekkeparambil Usha (born 27 June 1964) is a retired Indian track and field athlete. She has been associated with Indian athletics since 1979.[5] She is often called the "queen of Indian track and field".[6]
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