Method I Let x= distance travelled in 50 minutes 30 minutes =1.5km 50 minutes =x Cross multiply the two equations and solve for the value of x 30 minutes xx=50 minutes ×1.5km Divide both sides by 30 minutes so x stands alone 30 minutes ×x∕30 minutes =50 minutes ×1.5km∕30 minutes x=2.5km Method II Speed = Distance/Time Speed for the first trip =1.5km∕30 minutes Since he travelled at the same speed, we can use the first speed and time to find the distance Speed = Distance/Time Distance = Speed × Time Distance for the 50 minutes =(1.5km∕30 minutes )×50 minutes Distance =2.5km