What is 4/6 dived by 3/12

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?