



 
Hi Kerstin. You are asking how big is the gap between the two. Since they are moving in opposite directions, the gap is growing at a rate of 6+12=18 mi/h. So if the gap starts at nothing (when they pass), how large does the gap grow in 10 minutes if it could grow to 18 miles in one hour? Cheers,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 