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THEY WILL NEVER STEP OUT WITH RIGHT FEET TOGETHER. FOR EVERY THREE STEPS, THEY WILL BOTH STEP OUT TOGETHER. BUT THE SEQUENCE WILL BE (SHORT MAN-TALL MAN) LEFT-LEFT, RIGHT-LEFT, LEFT-LEFT, RIGHT-LEFT AND SO ON MAN 2 WILL SHOUT FIRST. MAN 3 AND MAN 4 WILL NOT BE ABLE TO TELL WHAT COLOUR HATS THEY ARE WEARING SINCE THEY CANNOT SEE THE OTHER MEN. MAN 1 CAN SEE MAN 2 AND MAN 3 BUT IS NOT ABLE TO TELL WHAT COLOUR HAT HE IS WEARING AS MAN 2 AND MAN 3 ARE WEARING DIFFERENT COLOUR HATS. SO MAN 1 WILL NOT SHOUT OUT. THEN BASED ON MAN 1'S SILENCE, MAN 2 IS ABLE TO INTERPRET THAT HE (MAN 2) AND MAN 3 ARE WEARING DIFFERENT COLOUR HATS. SINCE MAN 3 IS WEARING A BLACK COLOUR HAT, SO MAN 2 KNOWS THAT HE IS WEARING A WHITE COLOUR HAT THERE ARE 49 STEPS. HE CLIMBS HALFWAY, WHICH IS STEP 25. HE HEARS THE BIRD SINGING ON STEP 33. HE PICKS UP THE PEBBLE ON THE 21ST STEP AND TOSSES IT ON THE 22ND STEP. THE REMAINING 27 STEPS ARE TAKEN THREE AT A TIME WHICH IS 9 PACES (3 STEPS X 9 PACES = 27 STEPS) 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