mak10 Posted November 17, 2004 Share Posted November 17, 2004 A boy can walk up a stationary escalator in 90s. Standing on the escalator when it is moving, the student goes up in 60s. How long would it take the student to walk up the moving escalator? the problem sounds easy, but its not.... atleast not for me. so any help in solving would be greatly appreciated. thanks! -mak10 Link to comment Share on other sites More sharing options...
mak10 Posted November 17, 2004 Author Share Posted November 17, 2004 A boy can walk up a stationary escalator in 90s. Standing on the escalator when it is moving, the student goes up in 60s. How long would it take the student to walk up the moving escalator? the problem sounds easy, but its not.... atleast not for me. so any help in solving would be greatly appreciated. thanks! -mak10 Link to comment Share on other sites More sharing options...
swansont Posted November 17, 2004 Share Posted November 17, 2004 Figure out the speeds for the two cases, using an arbitrary distance. The speeds add - so figure out the time for that same arbitrary distance. The most rigorous way would be to use x, but the value will drop out, so you can e.g. make it a 90 meter escalator. Link to comment Share on other sites More sharing options...
swansont Posted November 17, 2004 Share Posted November 17, 2004 Figure out the speeds for the two cases, using an arbitrary distance. The speeds add - so figure out the time for that same arbitrary distance. The most rigorous way would be to use x, but the value will drop out, so you can e.g. make it a 90 meter escalator. Link to comment Share on other sites More sharing options...
mak10 Posted November 17, 2004 Author Share Posted November 17, 2004 wooohoo... thnx a lot swansont! you're a lifesaver! i get the correct answer now.!! -mak10 Link to comment Share on other sites More sharing options...
mak10 Posted November 17, 2004 Author Share Posted November 17, 2004 wooohoo... thnx a lot swansont! you're a lifesaver! i get the correct answer now.!! -mak10 Link to comment Share on other sites More sharing options...
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