document.write( "Question 630854: Two sisters leave their house at the same time, and walk in opposite directions. In 5 hours they are exactly 20 miles apart. Find their speeds given that the older sister travels three times faster than the younger? \n" ); document.write( "
Algebra.Com's Answer #397309 by 303795(602)![]() ![]() ![]() You can put this solution on YOUR website! Let the younger sister's speed be x. The older sister travels at three times the speed ie at 3x. \n" ); document.write( "In 5 hours the younger sister travels 5x miles and the older sister travels 5 times 3x = 15x miles. \n" ); document.write( "the total distance travelled by the two girls is 5x + 15 x = 20x \n" ); document.write( "ie 20x = 20 so x = 1 \n" ); document.write( "The younger sister is travelling at 1 mile per hour and the older sister travels at 3 miles per hour. \n" ); document.write( " |