You and your friends started industrial training in one of Megah Holding's branch last month. A rumor about the company giving 3 months bonus spreads among 400 employees. 10 employees have heard about it at 9 am and 100 employees at 12 pm. Let y(t) be the fraction of employees who have heard about it t hours after 9 am. (a) Write the differential equation for y(t) and find the solution. (b) How many employees would have heard about the rumor at 3pm?

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