Question 1179043
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From the condition, Bahir covered 500 m at the same time as Arav covered 400 m.


So, their speeds ratio is  {{{Bahir/Arav}}} = {{{b/a}}} = {{{500/400}}} = {{{5/4}}}.


It means that when Bahir will cover 5 lapses, Arav will cover 4 lapses,

so they will be at the starting point simultaneously at this time moment.



It gives you the <U>ANSWER</U> to the problem's question:


    Arav will complete 4 lapses,

    when Bahir reaches him from behind on the track,

    completing his (Bahir's) 5-th laps.
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Solved, answered, explained and completed.