there are 21 poles with a constant distance between each pola car takes 30 seconds to reach the 16th polhow long does it take to reach the last pole?

39.38 seconds

39.5 seconds

39 seconds

40 seconds

there are 21 poles with a constant distance between each pola car takes 30 seconds to reach the 16th polhow long does it take to reach the last pole?

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