What is the least common multiple of 4and10

Answer this question! 30 points and brainliest! only if you know the answer.

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.

Can someone show me step by step how to do this?