speed = distance/time speed =18km∕h and time =8h Subsituting speed and time in the speed equation above, ⇒18km∕h= distance ∕8h Make distance the subject. Since 8 h is dividing, multiply both sides by 8 h ⇒8h×18km∕h=8h× distance ∕8h,8h cancels each other leaving distance alone at the right side of the equation. ⇒8×18km= distance ⇒ distance =144km