document.write( "Question 1123958: Mang Gustin can climb a coconut tree at the rate of 10 ft. per minute and return at 20 ft.per minute. If it took him 3 minutes to climb and return, what is the height of the coconut tree?
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Algebra.Com's Answer #740336 by josmiceli(19441)\"\" \"About 
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Let \"+t+\" = time in minutes to go up the tree
\n" ); document.write( "\"+3+-+t+\" = time in minutes to go down the tree
\n" ); document.write( "Let \"+h+\" = the height of the tree in feet
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\n" ); document.write( "Equation for going up:
\n" ); document.write( "(1) \"+h+=+10t+\"
\n" ); document.write( "Equation for going down:
\n" ); document.write( "(2) \"+h+=+20%2A%28+3+-+t+%29+\"
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\n" ); document.write( "By substitution:
\n" ); document.write( "(2) \"+10t+=+20%2A%28+3+-+t+%29+\"
\n" ); document.write( "(2) \"+10t+=+60+-+20t+\"
\n" ); document.write( "(2) \"+30t+=+60+\"
\n" ); document.write( "(2) \"+t+=+2+\"
\n" ); document.write( "And
\n" ); document.write( "(1) \"+h+=+10%2A2+\"
\n" ); document.write( "(1) \"+h+=+20+\"
\n" ); document.write( "The tree is 20 ft high
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\n" ); document.write( "Check:
\n" ); document.write( "(2) \"+h+=+20%2A%28+3+-+2+%29+\"
\n" ); document.write( "(2) \"+h+=+20+\"
\n" ); document.write( "OK\r
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