Jawapan

2016-03-19T13:11:03+08:00
First you start thinking of things that add up to 18
9 and 9? no because they would both be equal
so start thinking of thinks that might work, and you will find that 
6+12 is 18!
6= ruby
6x2=will
6x2=12

ruby ran 6 miles and will ran 12.