document.write( "Question 532217: a bus trevels at a distance of 90 km in 2h and another 30 km in 1h. what is the average speed of the bus?
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Algebra.Com's Answer #350722 by Alan3354(69443)\"\" \"About 
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Add the distances, and add the times.
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\n" ); document.write( "d = r*t
\n" ); document.write( "r = d/t
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