Which direction does the earth on its axis ?

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Anybody wanna ? (picture included? )

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?