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S _ F _ L Y Clue
THE MAN WAS WALKING THROUGH A TRAIN TUNNEL AND WAS ALMOST AT THE END WHEN HE HEARD A WHISTLE AND SPOTTED THE TRAIN COMING TOWARDS HIM. HE THEREFORE HAD TO MOVE FORWARD, TOWARDS THE TRAIN, SO THAT HE COULD JUMP CLEAR SAFELY THE MAN WAS ON A BRIDGE WHEN HE FIRST SAW THE TRAIN SO HE COULDN'T JUMP OFF THE TRACK IMMEDIATELY THE TRAIN IS MOVING AT 40 MILES PER HOUR. IMAGINE THAT A FRIEND IS WALKING WITH YOU. WHEN THE TRAIN WHISTLE BLOWS, YOU HEAD AWAY FROM THE TRAIN, HE HEADS TOWARD IT. WHEN HE REACHES SAFETY, YOU WILL BE 6/8 (OR 3/4)OF THE WAY ACROSS THE BRIDGE, AND THE TRAIN WILL HAVE JUST REACHED THE BRIDGE. FOR THE TRAIN TO CROSS 4/4 OF THE BRIDGE IN THE TIME YOU CROSS THE REMAINING 1/4, THE TRAIN MUST BE MOVING FOUR TIMES YOUR SPEED YES. HE TOOK AS MUCH TIME FOR THE SECOND HALF OF HIS TRIP AS THE WHOLE TRIP WOULD HAVE TAKEN ON FOOT. SO NO MATTER HOW FAST THE TRAIN WAS, HE LOST EXACTLY AS MUCH TIME AS HE SPENT ON THE TRAIN. HE WOULD HAVE SAVED 1⁄30 OF THE TIME BY WALKING ALL THE WAY