I got this from timing 24×3 and you may ask how do u times it together well first start off with 4×3 and u get 12 then times 3×2 and u get 6 + 1 more u get 7 so that's how I got 72 for answer
All you have to do is divide by 18 to find the speed at which they work per hour since they worked 18 hours. Your answer would be 15miles/18hours= 0.83miles per hour
