Solution of task 8.4.10 from the collection of Kepe OE

If the total amount of your purchases from the seller Михаил_Перович more than:
- 200 $ the discount is 15%
- 100 $ the discount is 10%
- 50 $ the discount is 7%
- 20 $ the discount is 5%
- 10 $ the discount is 3%
- 5 $ the discount is 2%
- 1 $ the discount is 1%

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8.4.10
What should be the speed of rotation (rpm) n1 of gear 1, so that the body 3 moves with a constant velocity v = 90 cm / s if the number of gear teeth z = 26, z2 = 78 and the drum radius r = 10 cm? (Answer 258)