M4maths Maths Puzzle Category

odd one out.
438,218,108,46,25,11

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M4maths Other Question

1947! no. of zeroes In a kilometer race, if A gives B a 40 m start, A wins by 19 s. But if A gives B a 30 s start, B wins by 40 m. Find the time taken by B to run 5,000 m?

a. 150 s
b. 450 s
c. 750 s
d. 825 s