Four vehicles travelled on a road. What can you deduce from the times that they met?
Brian swims at twice the speed that a river is flowing, downstream
from one moored boat to another and back again, taking 12 minutes
altogether. How long would it have taken him in still water?
At Holborn underground station there is a very long escalator. Two
people are in a hurry and so climb the escalator as it is moving
upwards, thus adding their speed to that of the moving steps. ...
How many steps are there on the escalator?
A strange scene : imagine a conveyer belt, with tins
placed at regular intervals onto the belt at one end,
moving along at a steady rate towards a labelling
machine at the far end. A gerbil starts from a tin at the beginning
of the belt and steadily jumps from tin to tin, finally jumping off
immediately before the labelling machine.