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team B
each runs at b m/s , so time for team B = 400/b seconds
team A
time for 3 runners = 300/(5b/6)
time for last runner = 100/a
for a tie, their times are equal
100/a + 300/(5b/6) = 400/b
100/a + 360/b = 400/b
100/a = 40/b
40a = 100b
a/b = 100/40 = 5/2