Question 14
Square $ABCD$ has side length 20 cm. Three ants, Andy, Bobby and David, crawl along its edges. Andy travels from $A$ to $B$ then $C$ at 4.5 cm/s. Bobby travels from $B$ to $C$ then $D$ at 2 cm/s. David travels from $D$ to $C$ then $B$ at 3 cm/s. When Bobby and David first meet, how many centimetres is Andy from them? All three start at the same time.
