Harvest time

Grandma and granddaughter Julka reap currants in 15 hours of working together. Julka herself would have currants 10 days after 6 hours of work a day.
Find by what percentage the grandma's harvest time was shortened when the granddaughter was involved in current harvesting.

Correct result:

p =  25 %


j=10 6=60 h  15/b+15/j=1 15/b+15/60=1 15/b=115/60=34=0.75 b=15115/60=20 h  p=100 b15b=100 201520=25%

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