hmarie21 hmarie21

15-05-2017
Mathematics

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Luisa's current swimming record is 12% faster than it was last year. If her record last year was 4 minutes and 23 seconds, what is her record now? Round your answer to the nearest second.

Respuesta :

15-05-2017

If her speed this year is 12% faster than last year, her time is 100-12=88% of last year's time.

(88/100)(4min(60s/min)+23s)=231.44 seconds

(180+51.44)/60

3 minutes 51 seconds

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