Method I Let x= the time taken to travel 12 km 8 km took 1hr⇒8km=1hr 12 km will take xhr⇒12km=xhr 8=1 12=x Cross multiply both sides x×8=12×1 Divide both sides by 8 x8∕8=12∕8=3∕2=11∕2 NOTE: 4 goes into 12, 3 times and into 8, 2 times Method II Speed = Distance/Time Speed for 8 km in 1hr=8km∕1hr=8km∕h Let x= time taken to cover the 12 km Since the same speed was used to cover the 12km,12∕x should give the same speed (8km∕h) ⇒12∕x=8 Multiply both sides by x 12=8×x Divide both sides by 8 12∕8=x ⇒x=3∕2=11∕2