Help me please who gets it right I will mark brainliest

The amount of energy it takes to lift a box might be a function of which of the following

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling