document.write( "Question 536308: a bus travel at a distance of 90 km in 2 hours and another 30 km in 1 hour. what is the average speed of the bus?
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Algebra.Com's Answer #352298 by Alan3354(69443)\"\" \"About 
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a bus travel at a distance of 90 km in 2 hours and another 30 km in 1 hour. what is the average speed of the bus?
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\n" ); document.write( "d = 90 + 30 = 120 km
\n" ); document.write( "t = 2 + 1 = 3 hours
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\n" ); document.write( "r = d/t
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