What shape is this cross-section?

Pls! does anybody know a shortcut for answering these types of questions in the future?

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Julie was able to walk 16 km through the zoo in 6 hours. how long will it take her to walk 24 km through the zoo?