6th grade help please

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

What is the lcm of 16 and 40 ? 24 and 40 ?

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points