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 car is travelling along a dual carriageway at constant speed.
Every 3 minutes a bus passes going in the opposite direction, while
every 6 minutes a bus passes the car travelling in the same
Buses leave the depot at regular intervals; they travel along
the dual carriageway and back to the depot at a constant speed.
At what interval do the buses leave the depot?