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21.07.2019 •
Mathematics
It takes a girl 55 minutes to deliver the papers on her route. if her brother , it takes only 20 minutes. how long would it take her brother to deliver the papers by himself? if necessary, round to 1 decimal place.
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Ответ:
Ответ:
Answer- 31.11 minutes
Let 'T' be the total number of newspapers.
Newspapers distributed by girl alone in 55 minutes = T
Newspapers distributed by girl alone in 1 minute = T/55
Newspapers distributed by girl and boy in 20 minutes = T
Newspapers distributed by girl and boy in 1 minutes = T/20
Newspapers distributed by boy alone in 1 minute = T/20 - T/55 = 7T/220
On solving, total time taken by boy to distribute newspapers = 31.11 minutes
Ответ:
a triangle can only have 1 right angle