Acar travels up a hill at a constant speed of 38 km/h and returns down the hill at a constant speed of 66 km/h. calculate the average speed for the round trip. number enter your answer in accordance to the question statement units choose the answer from the menu in accordance to the question statement

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.