Bennett spent 4 hours at school today. he attended 3 70 minute classes. there is a 5 minute break between classes. then he lunch before going home. how long did bennitt spend eating lunch?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )