7,000 litres of water is pumped out of a tank in 42 minutes. How many litres could be pumped out in one hour at the same rate? (a) 1,000 litres (b) 1,670 litres (c) 10,000 litres (d) 12,000 litres (e) 60,000 litres

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.