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?
Bike Shop
Age 14 to 16 Short Challenge Level
I walked to the bike shop at a speed of 3 miles per hour, and cycled back along the same route at a speed of 12 miles per hour.