Write this number in standard form 400000+3000+50+2

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

I’m really confused and need to learn this

Jane has 5 nickels.john has 3 dimes.jane says she has a greater amount of money.with the information given,is she correct?